Thor Forums

[The Gritz Carlton]

A P Trap would cause a freeze issue. Since the fill port is capped, a straight as possible gradual decline position for the fill line is the best solution. Every RV I've had in the past worked this way and I believe it's the norm. In the case of my coach, and seems to be many others with Thor, the fill line drops below the input and causes water to pool. My suggestion (and I'm sure Thor knows this) is to just wire-tie the hose up a little in and around the middle area or shorten the hose a bit so as to eliminate the low point and allow water to just free flow downward to the tank. The only thing that would prevent this is if the tank input is lower than the fill port on the outside. Since the tank is mounted above the floor under the bed, this is possible. Most tanks in my past (travel trailer) have been under the floor level. In that case I would need to install some type of diverter valve that would allow the city connection to fill the tank. Then, I would need a pretty large, free-flowing overflow tube to indicate when tank is full and not blow out with pressure in the tank.