Tank drain valve

[Steve and Cindy]

The more I go through this old girl the more I find wrong. Tried the plumbing system for the first time. No shut off valve to drain the fresh water tank with and both the grey and black water tank drain valves leak like crazy. How on earth do you change out these valves when everything appears to be glued together (ABS pipe)? Also, what kind of shut off valve is missing from the fresh water tank? There’s just a hole. Van is an ‘88.

 

[TheLooks]

Cant help with the fresh tank drain as I can't tell what they may have used in that hole. The valtera valve can be purchased as the gate only as it can be removed by taking out the 4 bolts leaving the glued in flanges. Be careful not to break the flanges or you will be cutting and glueing. I can tell you that getting everything in place with enough wiggle room, in a non open ended pipe run is no fun.

 

[Steve and Cindy]

Got both Valterra valves swapped out but nowhere on earth have I been able to find the plug for the freshwater tank. Seems to be a very fine thread. Not even a mention of it anywhere.

 

[TheLooks]

Take a better pic on it with a tape measure and maybe we can advise.....

 

[Kevin D Pem]

I replaced mine by removing the bolts that hold the valve to the flange. Not a roadtrek but the valves are standard issue.

 

[Steve and Cindy]

No bolts to be found. And the flange appears to be glued in. No one anywhere knows what goes there. No RV shop. No store. No one online. Google produces nothing. All I can say is that a 3/4” thread in plug seems to go in ok but it leaks like crazy and I can pull it out with my fingers. I guess I’ll have to just glue the thing shut and get creative in installing a new one.

 

[Kevin D Pem]

Fresh water, not abs. Pvc or hdpe try a expanding rubber plug. Or maybe a rubber washer held in place with a toggle bolt.

 

[Steve and Cindy]

Fresh water, not abs. Pvc or hdpe try a expanding rubber plug. Or maybe a rubber washer held in place with a toggle bolt.

An expanding rubber plug sounds like a great idea. Never thought of it. The hole is only about 1/4” or maybe 3/8” deep though. Gonna try it anyway. Thanks.

 

[Steve and Cindy]

Well I tried a rubber expansion plug and it worked for about 5 minutes and then the drip started again.
I also discovered that the water line that goes from the tank to the pump is torn off. Is it possible that what I’ve thought was a drain plug is actually where the water line connects?

 

[Steve and Cindy]

The outlet looks like this. Has very fine threads.