Black & Grey Water Valves

After you put them in open the valve and pump grease till they start to close.

x2 on the grease fittings been working good since I put them in.

Add a Zerk fitting near the handle end.

Holding Tank Zerk

I - used mineral oil too, happy-camping

I had the same problem with my dump valves for years and after several sets of new seals and a couple of new valves, I think I figured out the problem. I used to use bleach as a final cleaning step for the gray and black water systems and I'd apply Rectorseal Plumbers grease directly on the valve seals and occasionally spray them with WD40. After a while the valves got harder and harder to operate until they would start leaking and one time, completely came unseated.

I have since learned that one should not use a petroleum based product on a rubber type product because it will swell and soften it. So now I'm using silicone grease exclusively on the seals and no bleach in the tanks and things seem to be working fine. We'll see. I took my first trip recently and so far so good.

I had the same problem last summer. It turned out to be the sheath on the cable assembly was split etc causing them to stop working, so the one grey water & the black water cables were changed. I was told while out west that it was the valve but it wasn't. It worked for me.

Like mockturtle, I use silicon spray lubricant on the handle shafts. Seems to work well.

I bought some valve lube, contains coconut oil or something similar.
bumpy

I added dish soap to the holing tanks and it seems to have worked.

When mine started getting difficult, I decided that replacing them was much better than waiting for them to fail.

Ron