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Aeroflow Check Valve Inline 4An AF612-04 ts-0553-1012 Simply cut the shape youCHECK VALVE INLINE 4AN BLUE ONE WAY VALVE Aeroflow AF 612 04 One Way Check Valve. This one way check valve features a Male AN fittings on either end in sizes ranging from 4 through to 16. The valve comes with a 1. 5psi spring installed and there is an optional 5psi spring where required. The length of the valve body is 29mm for the 4 to 8 or 35mm for the 10, 12 and 16 unit. Available in Blue, Black and Silver.