Allegro A750 Ambient Air Pump has rigid metal base as well housing and adjustable brass pressure relief valve. Air pump includes quick-connect rectus fitting and supply enough air for two respirators of one supplied air hood system. It has 50 micron inlet filter and 0.3 micron HEPA exhaust filter. It includes 3/4 hp motor with integrated ON/OFF switch as well as NEMA 5-15 plug and requires 115V voltage, 12A power at 60 Hz.