Black Acetal Copolymer valve use with 1/2" Hose system. Regulate coolant or air flow to your work area. 1/4 turn of handle opens or closes the valve. Light-weight and compact for in-line use. Body and stem material is acetal copolymer. Stem seals are nitrile (Buna N). 1/2" Male NPT Valve. 100 psi Maximum working pressure. 10 Valves per pack.