air pressure regulator ball valves gas regulator AIR PRESSURE REGULATOR The 5100P is a compact instrument air pressure regulator with a built in filter and dripwell. Regulates 0–30 (0–2.07 Barg) or 0–60 psig (0–4.14 Barg) air pressure for positioners, con trol lers, solenoids, etc. Standard unit supplied with mount ing nut for through-panel installation.