I have a H9 pump pistol that is 20+ years old. It sat for a long time without being used and now leaks air when pumped. Does anyone know where to get a rebuild kit for this gun?
Try generously lubing the pump first preferably with Alphabet org auto trans stop leak quick fix or regular Alphabet org extend the pump handle all the way lube the pump piston seal and work it in repeat several times. If you are lucky it will hold after a day or so of working it in. Shouldn't be that old probably a 91-93 unless it's a newer H9A that followed.
Otherwise...Contact .. For parts and or service...
Update: Regular Alphabet org fluid did the trick. I lubed the piston and after pumping it a few times the hissing noise of leaking air stopped. Thank you for the tip!