... : PP 3.Connection:Male Thread 4.Material:brass DescriptionAutomatic Air Vent Valve1.Valve Rod:Brass 2.Floater: PP 3. ... 4 Valve rod brass Valve bodybrass FloaterPP Operating principleWith the air is collected in top of the valve, the pressure ... manufacture and exporter of pneumatic components include air cylinder,solenoid valve,pneumatic valve,air treatment units,pneumatic fittings and PU tube ...