Interstate Pneumatics CA880Z 1/2 Inch x 1/2 Inch FPT Automotive Steel Coupler - Silver, Amflo C10. These couplers are interchangeable with the Automotive (True-Flate) Standard series couplers produced by other manufacturers. Precision machined from solid steel bar stock which provides longevity during mechanical shock in rugged applications. Maximum working pressure 300 PSI.