FlexPVC® Thread Sealant Vs Teflon (PTFE) Tape
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- Опубликовано: 1 июн 2024
- When should you use teflon (PTFE) tape and when should you use thread sealant (aka pipe dope) and why? And are there differences in thread sealant and if so what are those differences? The answer will probably surprise you. Also if you are sensitive to chemicals you will definitely want to watch this till the end.
Also watch our most popular video, "How To Fix A Leak In PVC Pipe" (for free):
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Thank you, thank you, thank you. I am a weekend warrior. You have finally explained something that I wanted to hear for a long time. Personally, I do not like Teflon tape. There may be times when someone may not wrap enough layers of tape on the threads. Or too few. This will only confuse the installer (i.e.; Is it too tight or not tight enough). Pipe compound gives me and others the proper feedback we need to continue on or to stop. I think Teflon tape is popular, especially among many contractors simply because it's not messy and looks aesthetically pleasing. I will now keep a low priced but very effective container of pipe dope on the shelf in my shop and move the Teflon tape to a less conspicuous spot in my shed. WELL DONE!
Thank you. I admit teflon tape is less messy and the cans never dry out, but I still think pipe dope is a better way to join NPT fittings. 🙂
Most videos show how to do things, but knowing the logic and mechanics as well actually helps a lot with the "how to" part. This video helped me to re-do a new sink shutoff valve that always seemed damp.
this guy is spot on, use pipe dope on new threaded pvc connections.....I found out the hard way trying to use teflon on new pvc threaded connection to a water softner. After 3 attempts with tape and leaks, finally used the dope, voila!!
Best explanation of pipe dope vs TT I've seen. Agree, like a free Master Class in Plumbing.
Glad you liked it!
Bless your soul sir! Pipe dope it is. I'm done with that damn teflon tape....
Thanks for this; ditching tape for all but crappy threads.
Fades away like a Force Ghost. Awesome video by the way
Very informative thank you for the information.
It's amazing these days how I can take a class on anything right in my own home with people like you on RUclips.
+David Zoller Agreed. :-) Thanks for watching.
Thanks. Exactly what I need to know replacing my old shower valve.
Down to earth kind of dude, it was nice seeing him laugh about this type of thing and I appreciate his explanation it made our job at home easier
At least in iron pipe, poorly cut threads seem to be the norm. I tend to use tape with a thin layer of thread sealant, like megabloc in these situations
Very timely to see this. Will be replacing my Fleck 5600 head on my water softener and as a retired phone man/cable splicer, plumbing does not come naturally to me. Wonderful explanations with sound reasoning from practical experience. Thank you very much sir!!! Teflon what???!!!
For aquarium pumps and PVC I've always used the tape and not had leaks or issues. The lube is good for going together but after 5 years the oil is gone and the threads grab more. Teflon tape keeps its lube properties longer than the pipe dope.
Hey...great video...you explain something simple so well...I about to put in water filter for my house and I'm using mostly plastic...with just a few metal parts
very clear and simple explanation. thank you.
GREAT explanation,I've definitely learned something that I will be going to try.thanks bro
Great Video! Thanks for sharing your knowledge!
This is really good. Thank you!
Well this video came in handy, here in Texas and 5 days below freezing and one morning -1, our homes aren't built for lengthy cold spells, I had to repair a broken pipe.
Great info! Thanks for sharing your knowledge!
I have had this wrong all along. I did not know that new treads should always be doped. I am fitting PVC male threads to brass female threads. My understanding is that I will have less chance of breaking the PVC because the plastic threads are male, but the point about uniform lubrication produced by the dope is logical. I am not a professional such as the presenter here so this is good advice.
Homeboy straight up vanished in the end.
Thanks old timer your awesome loved the video very informative I subscribed
great video. You answered a few questions.thank
good video, thank you for sharing the info.
Thanks for the great info !!
Thank you Sir for the information
excellent advice. thank you.
+rms59 Thank you!
Enjoyed your video very informative thank you
Thanks - very helpful
Thanks. I'm an old DIYer and have gone back and forth. I know about the feedback you're talking about but I didn't realize its meaning. With tape when tight PVC tends to jump while making a squeak which never felt right. What throws me is some devices like valves say to use tape. I was thinking they were worried about too much sealant being used and getting into the valve and messing it up. Now I'm thinking they just say tape because that's what people use.
Let no one who has the slightest desire to live in peace and quietness be tempted, under any circumstances, to enter upon the chivalrous task of trying to correct a popular error.
William Thoms, deputy librarian for the House of Lords, c. 1873
Can I use pipe thread sealant on sprinkler systems? Anti siphon valve connections to PVC recommends Teflon tape. Why is that?
Whats your take on all of us using more monster Teflon tape and pipe dope on top! How i was taught 14 years ago and have always done it that way. No leaks of course lol
Thanks...super video....much appreciated!
Glad it was helpful!
I disagree .... I have less leaks with tephlon tape . i been using tephlon on all my fittings for 40 years with no leaks
Very informative, thank you. How does the weld on blue compare to the rectorseal stuff as far as chemicals/smell?
I'm sorry, we don't sell rectorseal and I've not used that product personally for at least 15 years. Sometimes you can find info in the MSDS for any substances that might have issues.
Best in class. Thanks.
You are welcome. :-)
Question: Would I be OK to use a combination of both, PTFE tape like a monster blue along with spears 75 pipe sealant? Whats you opinion? Am I to also understand while applying sealant ,ONLY apply to the male thread and NOT the female? Thank you!
I would not. I'd use one or the other, but not both.
The reason people say to only apply to the male threads is that putting it on the female thread you are assured some of it getting into the water system. Extra sealant on a male thread ends up on the outside, whereas extra material on the female goes into the pipe. :-)
Great video. I have a quick question I have a male pvc fitting that i connected to a brass female fitting. I have redone the connection 3 times using nothing, teflon, and teflon plus pipe dope. I will try using pipe dope by itself with a new male pvc fitting. Do you think this will solve the issue, at first the connection doesn't leak but after a couple of weeks it starts leaking. Have you heard of a product called Hercules brush on block with that provide a better seal?
I am not familiar with Hercules, but if you have a male pvc going into a brass female and it leaks after some time, My guess is thermal expansion differences. Here is how I'd try to fix that.
On half the threads at the end of the threads, use the blue thread compound, then on the 2nd half use the teflon tape, 4-6 wraps. Give that a try and let me know how it does. Also after you get it tight, come back about 15 minutes later and check the tightness again, give it a little turn if you can. LMK how it goes. Thanks
The two 3/4" white PVC elbows that I picked up to make a U-turn with my outdoor whole house 3/4" PVC pipes seem to not be tapered (M to F) but rather straight. When I try to thread one into the other, they turn just one revolution and get snug. Maybe that will loosen up with pipe dope, or maybe I have been handed the wrong elbows. Are PVC threaded connections for plumbing supposed to be this snug, hence the need for the pipe dope?
Did get them from us? If so, LMK your order no. so I can look into this. As for a general question, if one is MPT and the other is FPT they will thread in about 2-3 turns before getting tight. YES thread compound will allow you to turn another 2-3 turns. And you should be good. It is possible that you are mixing BSPT with IPS (FPT/MPT) and that would not work at all. LMK. Thanks
Question: male threaded pvc to female brass, do I use pipe dope or a non hardening thread sealer? Thanks!
Hi great video on sealing pipe threads. I am having a bit of trouble with leaking industrial steam condensate pipework. What sealant would you use on 1" BSPT stainless steel pipe threads. They are to be used on steam condensate pipework. Pipe thread is BSPT and the fitting (Elbow Union etc) is BSP so a tapered thread screwed into a parallel thread.
Any of these would work great.
flexpvc.com/cart/agora.cgi?p=Pipe-Thread-Sealants&xm=on
(just confirm you don't have BSPP)
Thanks
Thanks for the info and great video, but do you still recommend “pipe dope” for air compressor fittings? Thanks again for you’re time.
-Chiefs Kingdom
For air compressors you are not supposed to use pvc pipe and fittings. The potential for damage is very great. If you are using steel/brass fittings, it's not as critically, but just personally I prerfer the dope over the tape just because I can feel the tightness of the fittings better with dope instead of teflon tape. But metal fittings are far more forgivable than plastic. HTH. Thanks.
Sir, just to clarify. Would you use the pipe compound on brand new plastic connections for a sprinkler system? Thanks.
Yes! :-)
Hi! Thanks for the videos. Maybe I missed one but do you bond the flexible pipe to the ridged PVC fitting the same way to bond regular PVC pipe? Thanks!
Yes, standard fittings with standard primer and cement. Just like normal.
I have a 1 inch cold water supply line attaching to the well casing Male pvc to female metal I didnt tighten it quite enough and I have a small pinhole air leak where the threads meet the metal. I cant tighten it because everything else is glued. What can I do without taking everything apart?
If you can dry it out completely 3M 5200 might fix that.
rainbird anti-siphon valves video say use teflon tape not sealant. Is anyone using the sealant for rainbird valve?
when using pipe sealant, do you have to wait for it to dry before turning the water on?
Generally not, but I usually do. How long depends on which compound you are using. 30 minute to an hour, but I've done it w/o waiting and not had a leak too. Lower pressures are less likely to leak. 50psi and down should not be a problem. 100psi and up I give it as much time as I can. Between those two, I wait as long as I can. :-)
No.
I will be using this on a 4 inch Male End Cap that every two to three months I need to remove, service the contents of the container and then re-seal it - I can easily remove the old 'tape' and apply new, but how about the Liquid Sealants, what do I need to do to remove the old and apply new ? I am building a DIY Aquarium Canister Filtration System that needs maintenance (new filtering media) from time to time - will be undewr up to 1250 Gallons per hour pressure, though it will not effect the threaded areas at as the water will 'splash' above the sealed area and flow downwards away from the end cap.
You can leave the thread compound on the cap/threads and just reseal. It'll last for many cycles.
Awesome, Thank you for the rapid response - much appreciated.
Does the thread sealant provide water tight seals ?
No, neither the teflon tape or pipe thread compound seal. They are to lubricate the threads so you can get proper torque applied to the threads. The threads are what create the seal regardless. hth.
What is the proper way to connect a threaded pvc to a brass ball valve ? Just dope only ?
If the pvc is going into the brass ball valve, yes, pipe thread compound, aka dope, is all you need. If it's the other way around, brass into pvc, you need the special reinforced fittings, (examples: flexpvc.com/cart/agora.cgi?keywords=-010SR )
why cant i just lubricate the threads with some type of oil instead of a thread sealer?
A reasonable question. I would say because some oils attack plastic and make them brittle. There is also the issue of contamination. The first thread will be exposed to water flow and so that oil will be contaminating the water going thru the pipes. Probably not something you want to drink. The pipe thread compounds have to be NSF rated not to be a hazard to human health. So if you use oil you'd probably have to use a food based oil and again you don't know how it will react with the pvc plastic.
Really the important issue is why one has noxious solvents and the other one does not. Same applications, specs, what's the difference and why? You know like pvc cement and cpvc cement. There is a reason why they use one or the other.
That is a very good question, but one I do not have the answer to. I think the most likely reason is cost of materials/chemicals.
If the tape is everywhere as you are saying, does that not indicate it gets the job done?
Just ignorance on the part of the consumer and tape has an appeal that compound does not: Tape is clean and easy to use. Using compound is messy and you have to clean up after you use it.
Say no more. Sold!
I don't like the tapes at all, but, do use the dope, do I need a certain kind for gas in black pipe?
+Grant W. Whitwam Weldon makes a 505 Key Tite™ thread compound for metallic threads. We don't sell it (almost all we sell is plastic pvc fitings and pipe) but you can find info on their website weldon.com However all the Weldon thread sealants say good for metal or plastic. So go figure. :-) But the Blue Weldon Thread Sealant compound we sell will work on metal and plastic threads.
no you are not allow tapes on gas black pipe it is against plumbing codes...few states allow that ..here in ny..it is not
When you look up a part on google and youtube recommends the only site supplying the part your looking for...
How is Rectorseal Tru-Blu pipe dope?
I had some brand new brass fittings today that leaked with paste, then sealed with tape so apparently the tape isn't just for old worn out fittings.
Tape works better on metal. Sorry I did not include that in the video. But paste should also work fine as well. Could be the brand or maybe you didn't go tight enough? Just offering another possibility.
@@FlexPVC I definitely went tight enough, one of them I kept pushing 'till it broke and it was still leaking right up to the point it broke. I seem to have really bad luck with pipe fittings. On my last project I was trying to seal a male plastic PEX fitting to brass. I tried tape and dope, light torque, heavy torque, nothing worked. I finally went with Permatex Right Stuff and it sealed.
@@DonziGT230 This is a long shot, but I've seen it before. There is another tapered thread standard: BSPT. BSPT LOOKS just like NSP. The diameters and tapers are exactly the same. The difference is the angle of the actual threads. 55 degrees vs 60 degrees. That 5 degree difference will cause leaks like this. And with some much coming out of china and where-ever, the customer can't be assured of what they are getting. That, or simply outright in correct threads are the only thing that could cause such a leak. Glad you found a solution.
@@FlexPVC I never have problems when working on trucks/heavy equipment where good quality parts are used so it's very likely that it's the modern Chinesium stuff that's been my recent problem. I recently learned that there are different tapers as well.
In sprinkler systems, it is not recommended to use pipe dope(????). I don't know of anyone who uses pipe dope. If you have to take a joint apart The tape helps but not pipe dope for removal, I was told by a supply shop not to use it.
Can you smoke pipe dope?
Now he tells me...where was he 44 YEARS AGO??`
question: can i thread a female 3/4" pvc fitting onto a galvanized pipe end? NOBODY seems to be doing this, and it's getting me a little concerned.
hey, don't show people to sniff directly from a chemical container! waft it with your hand like a fancy scientist instead.
+Widemouthful Re: threading a female pvc fitting on to a metal pipe is risky. You run the risk of cracking the female part. They make special stainless reinforced parts for such an application. Seach our site for "stainless reinforcement ring" or 435-007SR in particular.
I understand your point about sniffing a can. If we remake the video we'll update it. Thanks.
+Flexpvc thank you
+Widemouthful You can, but you do run the risk of cracking the pvc plastic. They make special reinforced (with brass inserts or stainless steel collar) fittings for this. If you use the garden variety pvc fittings threaded on to any metallic male threads, you run the risk of cracking. And if not now, sometimes in the future. A quick fix is to put a hose clamp around it and tighten. Not the best way, but it's a cheap way to maybe prevent them from cracking.
And yes, sticking my nose in the can is a not a good example. Thanks for pointing that out. :-) Sorry to late on my reply. Thanks for the questions and comments.
+Flexpvc you already replied before, guess RUclips just wasn't showing you your previous reply up there... anyway, I like that hose clamp idea. funky! I ended up avoiding the project altogether due to the cost of metal parts.
No, unless you are using reinforced fittings. See:
flexpvc.com/cart/agora.cgi?keywords=-007SR
Standard fittings will crack and fail. (leak)
hth.
Smell the Chemicals AKA (DOPE) your head will spin...........
Not really. I've smelled all the ones we sell. Some have zero smell at all. One has a small smell but not really "bad" smelling. The 3rd did have a pretty strong chemical smell and I don't think we sell that one anymore.
Ok, my life has been a lie.
One newer important reason to avoid PTFE (teflon) is problems with PFAS in environment. You may have learned from news about the huge global environmental problem PFAS have become. A lot of drinking water wells is contaminated. Nine US states have made severe restriction on products with PFAS. The problems is normally not teflon itself, but the factories that produce teflon is emitting PFAS to environment. So we should stop using it when ever possible.
You have oveasly have not worked with any materials outside your little store or you would know better.
I only comment on what I know. If you are joining other materials other than plastic to metal, or plastic to plastic, you my have different results. But for metal to plastic and plastic to plastic I stand by my advice.