I have 3 IR recip, 300 PSI, 400 RPM compressors My discharge valves are deeply pitted and need to be replaced. What I'm looking for are sources other than IR which has given me a long lead time to get what I need. All my equipment is used for the research into the development of future propulsion systems. One source is not enough. The model I have is a 3HHE-3. at the moment more specific #'s are at work. If you have or know where a source might be, I can be more specific. I have pictures but I would need to have an address to forward them to. Any help will be appreciated, Thanks!