Propane Pigtails Leaking

If it's any help, I've had to replace both pigtails on our TT. One leaked during a trip a couple of years ago, and the other hose was suspect as it had taken a set to the way it was flexed. Mine leaked near the fitting that screws into the regulator. A little soapy water showed the hose itself was leaking, not the connection at the regulator.

The fittings on the hose were crimped, so no fixing them at the campground. Fortunately, there was a Camping World about 5 miles away.

If you replace one, go ahead and replace both. Same age, likely to fail too. I did keep the one working hose as a spare... just in case.

Thanks for the details. At least I understand how they work. I did not realize there was a seal inside of the fitting on the propane tank. I cleaned it with some soapy water and a Qtip. The leak stopped and I will soon replace the tank.

ACME Nut components

Nipple:
Stub with metered hole. It pushes the spring-loaded shut-off valve inside cylinder service valve OPEN. Hose has to be attached to cylinder for propane to flow




Thermal Bushing:
Melts when exposed to temps over 240*F. Causes 'nipple' to slide and Closes spring-loaded shut-off valve inside propane cylinder service valve

2 Styles.........
Old version------thermal bushing exposed at backside of nut



NEW version------thermal bushing not exposed but identified by slits in nut




Excess Flow Check Valve:
Spring loaded 'steel ball' that moves against spring when cylinder service valve is opened (partially restricting propane flow). When downstream line pressure 'equalizes' the spring moves ball back allowing full propane flow. THIS is the 'check valve' that can trip closed when propane cylinder service valve is opened to quickly.

Thanks. I was confused because my BBQ grill and garage heater attach differently. I see the rubber gasket in the tank that is supposed to form a seal. My pigtails should be OK and the tank is to blame.

I tried returnable Paraco tanks from Home Depot. All of the tanks are out of date by several years and do not even show recertification. I have tried to get certified tanks at Home Depot but gave up. Lowes will accept this tank in exchange and has new tanks in stock.

To answer one of you questions about how they seal...they actually screw into a female fitting on the hose itself..

Can't help you with the other question, "What am I doing wrong."

A longer hose may help. They seem to last longer for me if the bends are more gradual.

Look closer at the tank end, there are rubber seals inside the tank connection (not the pigtail). If they're damaged or missing then it will leak.