Here is why my valve is draining slowly. Just pulled it apart, and the valve is not a full flow valve so it has a restriction that trapped the millings from the water tank that never got cleaned out. I figured I was so far into the tank that I would change the valve to a full flow valve and check my system for leaks and I am glad I did. On the drivers side; the shore water connection under the bed behind the access panel was leaking which only required tightening by hand, looked like it had dripped for awhile. Under the passenger side bed I found that the large diameter fill line and vent line were leaking at the bulkhead fittings. I purposely overfilled the tank to see if they leaked and they did. So I just went ahead and replaced the hoses. The reason for replacing the large fill hose was because I felt it leaked because it was corrugated, it said on the hose "smooth bore" but it wasn't. I went to Goodyear Rubber Products and picked up the hose and some really cool new hose clamps, they are called smart seal clamps and these were for the fill line. The smart seal clamps weren't available for the smaller 3/8" line so I bought some shielded clamps. I changed the small line because it got a little messed up when I removed it from the barb fitting, plus I already had that on-hand. For the drain valve I went with CPVC which I felt was a good replacement plus full flow. I made sure that I kept a flexible hose between the valve and tank so that it wouldn't be rigidly mounted to the tank which might break the tank at the fitting. I imagine that is why PC does the same thing. The good news is that it drains like a horse peeing on a flat rock, drained in less that 5 minutes from completely full.
I have a question maybe someone can answer, I am including pictures of a pex fitting that seals to the pump and is also used in several other locations. Can anyone tell me where I can buy a couple of seals and if there is a specific name for the seal?
