1.Oxygen regulator:brass body and connenctors for maximum durability and service life; ... or 1 dayThis type of pressure regulator(oxygen regulator,gas regulator,flowmeter) has following features:1) Designed for Oxygen, acetylene,argon,CO2,C2H2 etc applications ... design8) Sintered bronze inlet filter9) Scale: single or double scale with PSI (lb/in), bar, kgf/cm210) For flowmeter,polycarbonate flow ...