Fresh water gate valve leak

Rycher wrote:
it is inch and a half pipe. 1 1/2 .

and i felt inside the hole and there is no connection up in the tank..looks to be spun weld.

From your pix, it is either spun welded or glued in..

If you had an extra large opening on top of the tank you could cut off and replace the damaged fitting with a replacement bulkhead tank fitting..



The replacement bulkhead fittings use a rubber gasket on both inside and outside of the tank.. But to use them you have to have an opening large enough to get the replacement bulkhead fitting inside the tank..

So, unless you want to make a top opening (which would also need a bulkhead fitting to close it off when done) your options are to find someone that does plastic welding or has the equipment to spin weld a new fitting in place.

Fair chance that large gate valve contributed to the demise of that fitting..

I was looking at those Gdetrailer.. or something similar.. i went ahead and used some jb water weld to see if that fixes it. i can see a very fine small crack so i figured id try that first. i also found these type of compression fittings used for repairing fresh water tanks. use a hole saw to cut out old connection and use these. may try if jb wter weld doesnt fix it.

https://www.recpro.com/universal-fresh-water-fittings-installation-kit-with-sensors-for-pvc-pipe/

You could use something like this if your fingers are nimble enough.
Use a good sealant like urethane with bolts through tank. Hardest part would be getting bolts or nuts installed.
spigot flange

You might be able to carefully cut away and scrape down the fitting flush with the tank and install a spin weld patch, then drill and spin weld a new fitting near the patch. The fittings and patches are really cheap. The problem is the the tools that hold the patches and fittings are size specific and each one it very expensive. They have 1/4 inch shanks and are to be chucked into a router to spin them at over 20,000 RPMs to melt the plastic fuzing them to the tank.

I have some links I can give for sources for the fittings and patches. I might even have sources for the tools. I'll post them later as I need to find them and I need to get some sleep my muscle relaxer is kicking in.

The white connection is a different color than the spin-welded flange, and has ridges on it, suggesting that it is screwed into the tank flange. Have you tried backing it out using a large pipe wrench?

4x4van wrote:
The white connection is a different color than the spin-welded flange, and has ridges on it, suggesting that it is screwed into the tank flange. Have you tried backing it out using a large pipe wrench?

I kind of wondered that myself, but enlarging the OPs photo it looks like the threaded portion is slightly embedded into the different color of the plastic and there is no "nubs" on the light portion on the tank..


Click For Full-Size Image.

Compare to a spin on flange..


Click For Full-Size Image.

Makes me wonder if the plastic that when heated changed color some when it was spun..

Based on the enlarged phot I am thinking that a sealant was used between the fitting and tank. Looks almost like Dicor.
That is a threaded connection between the white PVC and flange on the tank.
Being white, the tank is probably polyethylene and not easy to repair with most sealants.

My Grand Design has a 1 1/2" valve for dumping the fresh water.