Yea man we use both, definitely dope on metal only connections. Pvc to brass I use both, tape on the back of the threads and dope on the leading threads. I only use Teflon based dope though, the oil based dopes weaken and brittle pvc over time. The best Teflon tape I have found and worth the extra cost is Blue Monster by Millrose. They have all the different sizes and the rolls are huge, one will last you a week of taping probably. Take it easy and stay warm and dry! Casey
Thanks for the video! I just crawled out of the well. Deep well, about 300 ft. Just before Christmas, we lost power for two days with single digit temperatures. I kept waiting for the power to come back and knew the well would freeze with no power to the heat tape. It did. I thought it would thaw and work eventually, but it didn't. I found a brass check valve that had a welt on it, and it was also cracked. A union that I was able to get apart, but I couldn't get the pipe out of the union. I got it out of the brass check valve. I replaced the rest from the valve out to the PVC going underground to the house. The barbed fitting going into the PCV was also plastic. Even that was tough getting out of a coupler. Depot, here, didn't have any metal barb 1" fittings. Where I put PVC couplers, I put Teflon tape. I didn't put too much torque on the plastic, but they are seeping water. A project for another day.
For any stainless to stainless connection, e.g Grundfos pump to Simmons 617SS check valve, DO NOT use regular Teflon tape or pipe dope. Use tape AND dope made for SS fittings that contain nickel. This will prevent the threads from galling.
yes we have done that before on certain fittings that have a slow drip and thr fitting is tight. Both tape and dope has stopped a slow drip from a fitting
Using a quality grade tape helps to avoid problems. Teflon tape is sold in grades. The white version is most common. However the denser yellow tape (thicker) can be used, and you may not need the dope or string. White: used on NPT threads up to 3/8 inch. Yellow: used on NPT threads 1/2 inch to 2 inch, often labeled "gas tape" Pink: used on NPT threads 1/2 inch to 2 inch, safe for potable water. Green: oil-free PTFE used on oxygen lines and some specific medical gasses en.wikipedia.org/wiki/Thread_seal_tape Using dope and or string as additional sealing should be reserved for problem joints.
How many times should the Teflon tape be rotated around a threaded pvc to go into another threaded pvc? I'm going nuts to get absolutely no leaks on my sprinkler connection to actuator. I put lots of Teflon tape, could barely screw it on. And the leak is extremely minimal but if I wait 5 minutes, there's a small weepy drip coming out on one side. WTH!
I was doing some propane plumbing on my RV yesterday, all brass 1/4" pipe thread fittings, regulated to 30PSI. I used Permatex Teflon paste on all the joints, 2 of them leaked. Tried tightening them more, no luck. Took the paste off and installed tape, problem solved. Right before finding those leaks I discovered that the 1/4" pipe fitting I'd installed on my compressor's air hose with the same dope had a small leak. I don't get it. Is it possible that I over tightened them and squeezed out the pipe dope? It's all I can figure I might have done wrong.
Here are my thoughts. First, I like your information. But a question I'm having is what about tape with dope over it? My metal/metal connections for a valve leaks with tape only. Help!
I'm left scratching my noggin here. I have connect the drain hardware on my tub. The hardware connecting directly to the tub is a brass kit. The P trap and piping is PVC. The pipe behind the wall is galvanized steel. What should I use to connect these to reach other? I have both Teflon tape and dope.
Yea man we use both, definitely dope on metal only connections. Pvc to brass I use both, tape on the back of the threads and dope on the leading threads. I only use Teflon based dope though, the oil based dopes weaken and brittle pvc over time. The best Teflon tape I have found and worth the extra cost is Blue Monster by Millrose. They have all the different sizes and the rolls are huge, one will last you a week of taping probably. Take it easy and stay warm and dry!
Casey
Thanks Casey, We will have to check the blue monster rolls out. Right back at ya man, stay dry and avoid the monsoon!
Thanks for the video! I just crawled out of the well. Deep well, about 300 ft. Just before Christmas, we lost power for two days with single digit temperatures. I kept waiting for the power to come back and knew the well would freeze with no power to the heat tape. It did. I thought it would thaw and work eventually, but it didn't. I found a brass check valve that had a welt on it, and it was also cracked. A union that I was able to get apart, but I couldn't get the pipe out of the union. I got it out of the brass check valve. I replaced the rest from the valve out to the PVC going underground to the house. The barbed fitting going into the PCV was also plastic. Even that was tough getting out of a coupler. Depot, here, didn't have any metal barb 1" fittings. Where I put PVC couplers, I put Teflon tape. I didn't put too much torque on the plastic, but they are seeping water. A project for another day.
For any stainless to stainless connection, e.g Grundfos pump to Simmons 617SS check valve, DO NOT use regular Teflon tape or pipe dope. Use tape AND dope made for SS fittings that contain nickel. This will prevent the threads from galling.
Thanks! Straightforward advice and easy to understand. (Good tip on wrapping direction too.)
I LIKE it. Makes perfect sense.
Q: What happens if you don't have Dope and use Tape on metal-metal connections?
Thanks Man! Your video was a huge help!
Blue monster tape is the best teflon look for it.
Some times i use both dope and tape.
I read that teflon tape was only for lubricating the threads, vs actually providing a water tight seal. True or not?
from what i have heard that isn't true
Teflon was not designed to seal joints, it’s actually used as a lubricant between metal fittings.
Good information. Thanks!
I have heard that some people apply teflon tape first then pipe dope over top of the tape on PVC threads. Does that make any sense to you?
yes we have done that before on certain fittings that have a slow drip and thr fitting is tight. Both tape and dope has stopped a slow drip from a fitting
Using a quality grade tape helps to avoid problems. Teflon tape is sold in grades. The white version is most common. However the denser yellow tape (thicker) can be used, and you may not need the dope or string.
White: used on NPT threads up to 3/8 inch.
Yellow: used on NPT threads 1/2 inch to 2 inch, often labeled "gas tape"
Pink: used on NPT threads 1/2 inch to 2 inch, safe for potable water.
Green: oil-free PTFE used on oxygen lines and some specific medical gasses
en.wikipedia.org/wiki/Thread_seal_tape
Using dope and or string as additional sealing should be reserved for problem joints.
Thank you
How many times should the Teflon tape be rotated around a threaded pvc to go into another threaded pvc? I'm going nuts to get absolutely no leaks on my sprinkler connection to actuator. I put lots of Teflon tape, could barely screw it on. And the leak is extremely minimal but if I wait 5 minutes, there's a small weepy drip coming out on one side. WTH!
Wrap teflon tape 4-5 times on pvc.
@@jag4790 Thank you.👍
I was doing some propane plumbing on my RV yesterday, all brass 1/4" pipe thread fittings, regulated to 30PSI. I used Permatex Teflon paste on all the joints, 2 of them leaked. Tried tightening them more, no luck. Took the paste off and installed tape, problem solved. Right before finding those leaks I discovered that the 1/4" pipe fitting I'd installed on my compressor's air hose with the same dope had a small leak. I don't get it. Is it possible that I over tightened them and squeezed out the pipe dope? It's all I can figure I might have done wrong.
I doubt it, sometimes things can just be aggravating without reason
Here are my thoughts. First, I like your information. But a question I'm having is what about tape with dope over it? My metal/metal connections for a valve leaks with tape only. Help!
Try dope only on your metal to metal connections. That should do it but if it doesn't, try dope on top of tape next.
@@WendellLeeWellServices Thanks, I did tape leaving a 1/3 metal on the end. Then dope on all of it. Worked!
How about silicone rtv like pipe dope?
Thank you cutie...You answered my question!
I'm left scratching my noggin here. I have connect the drain hardware on my tub. The hardware connecting directly to the tub is a brass kit. The P trap and piping is PVC. The pipe behind the wall is galvanized steel. What should I use to connect these to reach other? I have both Teflon tape and dope.
I've used the rubber boots with clamps to join anything I could that may need to be taken apart easily later on.
Excellent thank you
Aint gonna lie, i like my dope.......
What do you use for PVC to PVC connection?
teflon tape
Naw! good job thanks for clarifying, and now I know the professional developments good technique, not jacked up crap ....justsayin
Cheap bastards keep making the tape thinner so they can say it's 500ft. long instead of 100ft long so you say "WOW, lookie here, 500ft for 99 cents"