Stainless steel
【Specification】：With 45mm diameter glycerine filling gauge, 0~ 40mpa, max pressure 6000psi fill station designed for paintball HPA tank, or an air rifle from a SCBA (fire fighting) tank.
【Knob type exhaust valve design】：With knob type exhaust valve make the air outlet smoothly, which is safe to use operate and durable to use.