How To Fix & Replace John Guest RV fittings

Water is a wonderful life saving resource we all need. But at the right time and place!
It can be the bane of our life when it enters our Motorhome Caravan or other RV - whether by way of a leaking hatch, window or other.
That’s bad enough but when a Pressurised water system leaks ( spurts or floods more like it) all through one’s ‘home away from home’, it can mean disaster, potential damage of flooring, furnishings and at the very least a big annoying cleanup.
What’s really aggravating is when the cause is a plumbing fitting which has burst- or worse, a fitting incorrectly fitted in the first place.
So it can be with John Guest fittings and connections. In the main they’re plastic and have either a rubber O ring or a rubber washer seal. Remember that even though they’re in an RV they’re still working under pressures equivalent to mains house pressure.
This Bazza’s Tips ‘How to’ video shows how to repair the 1/2” John Guest pipe to 1/2” BSP brass thread fitting. The cause in each of my three cases ( where each fitting burst cause flooding inside out RV) was pink thread tape wound round the male brass thread. When the female John Guest hex nut was screwed onto the male brass thread, the forces (when the brass thread ‘bedded’ down into the seat) cause a stretching of the plastic threads which eventually succumbed, causing water to flood everywhere.
So, Bazza’s tips advice is DO NOT use thread tape in plastic fittings where there’s already a rubber seal in the base. The rubber seal by itself is sufficient and should do the job.

[@man.i.literally.failed6772]

Best thing I did was put 1.5 laps of tape on the sink mixer connections, they say not to use tape but when I got my new van everything was leaking, now it's not, and I'm also not a fan of connecting main hose to the van. I carry about 3m of each hose color, and have a emergency kit ( cost me $160) with all types of clamps and fittings.

[@StephenStewartSydney]

Thanks Barry. They are prone to crack and fail even without the tape. We have toilet paper secured around all fittings and pipework so one can readily identify a failed fitting as we nolonger leave the pump turned on when not using.water and we nolonger use direct from tap water supply that won't stop if there is a failure. We listen carefully to the water pump when we turn it on to see if it let's us know there is air in the line and hence a water leak. All our plumbing is between the two floors or in the cupboards or walls and so the leak can't escape to ground, rather it wets the timber construction should we not notice. So we have become somewhat cautious after a couple of failed fittings.

[@barryBJM]

Our first one was the hot water outlet from the Truma HWS. We’d been travelling and stopped for afternoon tea, only to find water running out from under a bed , where the HWS was.
No warning - so it’s off with the 12v water pump when travelling.
Not a big fan either of hooking the mH up to mains water.