Bendix AD-IS air dryer Purge valve issue

Installed a brand new air dryer on my truck 4 days ago. The old one was purging constantly and would not build pressure in the tanks. Last night the new started doing the exact same thing. I pushed a socket extention up into the purge valve and it popped back closed. Today it has done the same thing several times. So I pulled the nipple off the purge valve and found a broken, flat, rubber seal/gasket hanging out of it. So I pulled it out. See picture. The dryer is still functioning, still purging when it should etc... My question is what the hell is this gasket and am I going to have problems down the road?