The Gates 4C1T-4RMP Field Attachable Type T for G1 Hose (1 Wire) - Male Pipe (NPTF - 30 Cone Seat), 1/4" ID is made of zinc plated carbon steel and used for hydraulic hose applications. These couplings are one piece crimp couplings that are Field Attachable Type T for G1 Hose (1 Wire).