I'm fairly new to framing and recently purchased my first underpinner, an old Arquati Perfecta. The guy I bought it from assured me it had no leaks and was in good working condition. I got it home, hooked it up and it was gushing air. One of the three air valves is leaking out of one of the two exhaust silencer ports. As you press the foot peddle down the leak stops when cycling through. I took the valve apart and tried to inspect/clean it and all looks fine - no broken seals, looked in working order. That didn't help. I took the foot controller valve apart and somehow made that leak. I may have put it together backward. Not sure but I'll give that another try since it was working correctly before I tore it apart. I've contacted Universal Arquati but they couldn't help as they stated they bought Arquati well after that model was made so they had no way of helping me troubleshoot or provide parts. I then contacted a company that sells the brand of valves (Pneumax) and they stated the valve is no longer being made. They are going to contact Pneumax to see if a current valve will work in it's place. In the meantime I thought I'd reach out to some pros for any advice. I'm certain I'm missing something as this type of equipment is new to me. Thanks for any help.