SpudFiles

I need to buy some rubber sheet, a 3 inch rubber washer, or something rubber that will work as a sealing face. I've tried the gasket material they have here in town and nothing works. A link to a site or if you'll sell me some yourself would be helpful.

P.S. Where do you get your's pimpman, I know you live here in southern Utah.

He gets his from mendards.
Try black chalking tube stuff, i used it in spazooka mk 2

I get mine from McMaster. I've got 70A neoprene and 40A Buna-N sheeting.

I use gasket material from home-cheapo, on small pistons it doesn’t work but on biggins it does.
A thought just hit me; you know that foam rubber stuff you get at craft stores? Well it’s airtight, or at least the stuff I got is, I wonder if it would work? You’d probably need a couple layers.

I've used practise rubber sheets for drumming... check for some of those?