Webster Air Compressor

I have been lurking here for a little bit and find a HUGE wealth of information! Thanks!
Anyway, onto my problem now. I have a small Webster air compressor, it's
a 2 cylinder compressor, looks to be a solid cast iron pump, the number "41" is stamped onto a little plate on the compressor. It's on about a 11 gallon tank with a 7 HP gas B&S motor. The problem is that after I shut off the motor I can hear air hissing out of one cylinder of the pump, that and I am sure it should pump more air then it is. I suspect that it just needs the valves replaced and a new head gasket put on (does that sound about right?)
I am going to try and get a picture or two of it, but on the top of the cylinder head there is a little outlet, that has a copper pipe that attach the two cylinders together, and one end just ends, no cap, no nothing, just threads and open tube. It does look like it might have been attached to the tank at some point. Is that some sort of unloaded for it, to let it free-wheel when the tank is full?
Does anyone know who makes/sells parts for these Webster air compressors? I would also like to find out the RPM that it should be running at, or what the max RPM is.
Thanks for reading!
~Brian
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The air you hear hissing:
Is most likely the check valve in the tank, which keeps the pressure from backing up into the pump, for easier restarts. Start there before you spend a ton of money on otherwise unnecessary work.
Refinish King

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