Screwed PVC

[MrPotatoHead]

Looking at the Supah Piston Valve. Are there any gaskets or anything to keep a good seal at the end of the "T" other than just the numerous screws? Or will the screws alone hold a good seal?

Reason I ask is because I was thinking of useing a bunch of screws to hold down my 4" reducer to the end of the pressurized chamber so I can still have access to the inside if need be, but wanted to know if I needed any other materials for an air tight seal.

[boilingleadbath]

Joel has an O-ring to make it seal - otherwise, it'd leak pretty fast, maybe even fast enough to trigger the valve, although I can't say for sure because I don't know what his clearences are.

We have a recent thread with pictures of his internals, including a picture of the endplug, incase you are wondering what I mean by an "O-ring".

[Atlantis]

I believe the 3" PVC rod that is in the end seals it enough, the screws just hold it there. Since the edge of the rod is resting against the small lip in the tee, it should hold pressure. I'm not entirely sure though.