Brand new OEM replacement check valve for Rolair air compressors. This is used with Rolair Bull air compressor models. This check valve features a 3/8" Male Flare thread and a 3/8" Male NPT with an unloader valve that accepts a 1/4" tubing. Specifications: 3/8" Male Flare Line Input 3/8" Male NPT Tank Input Inverted Compression Unloader Port: Accepts 1/4" Tubing Part Number: FC347043000