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Thanks! I will pm you about the docs. I tried to move those plugs and couldn't even get them to budge so I just gave up on that. I pumped it up to its max and that check valve started leaking from the seams. It is definitely external just need to replace it now.

bump?

I also wanted to know if anyone knows if the check valve is internal or external on one of these things? there is air coming back out of the intake and the pump is under load when it stops running so I am guessing the check valve is bad.

Ok I am new to this board however I have lurked for a while and read tons of threads on here. Here is my story just bought this compressor on Craigslist last week. Its a 70 Gallon tank with a Brunner A212 pump and a monster 2 hp motor. Built in 1953 I dont know its history however it was...