GROCO NPT 90 Bronze Fuel Valve 1/2". 1/2" NPT 90 Bronze Fuel Valve Specifications for GROCO 1/2" NPT 90 Bronze Fuel Valve: Manufacturer: GROCO Color: Black Features of GROCO 1/2" NPT 90 Bronze Fuel Valve Compact design 90 flow path 1/2" NPT male and female ports Use FV-590 (Brass) for fiberglass tanks Use FV-590-S (316SS) with aluminum or stainless steel tanks Package Contents: GROCO 1/2" NPT 90 Bronze Fuel Valve GROCO FV-590: NPT 90 Bronze Fuel Valve 1/2"