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Compatible with Holley 19-174 EFI and standard carburetor systems. Diameter 1.35 in, Length 2.8 in, Connecting hook: 5/16 inch, hook length 1 in, angle bracket version 1.6 in, screw length 1.15 in. Valve body material: Aluminum alloy, corrosion resistant and suitable for gasoline environments. Used for tip-over protection of the fuel tank, preventing fuel leakage in the event of vehicle tilting or rollover. Provides one-way venting to maintain stable internal pressure in the fuel tank.