Greetings. I tried to do a search, but it said I didn;t have the "rights", I was hoping I could find the solution already posted.

I am pushing water through the flanges on my multiport valve and filter body (AG Sand filter).

I took it all apart, replaced the O-ring (the old one was dry rotted), and lubed it up. I cleaned the mating surfaces before installing the O-Ring. I then tightened the two sides equally, a few turns on one side and then a few on the other. It ran fine and I thought I had it licked, but about 2-3 hours later I went back to check and it was pushing water again?

Unfortunately I don't have a pressure valve on the filter body, so I don't know if I have unusual pressure. the water outflow is nice and strong, so I don't suspect there is a clog?

I appreciate any help. The one thing I haven';t done in a while is change sand, I will pull it all apart and do that tomorrow....after that, not sure what else to try??