Industrial Interchange Nipples (pneumatic, air) connect with Parker's 20 Series, 30 Series, HF Series, Universal or E-z-mate Couplers. These air hose connectors are unvalved and conform to A-A-59439 (MIL-C-4109F, ISO 6150-B) standards to be globally interchangeable with other products manufactured to the same requirements. Parker's steel pneumatic nipples have hardened wear points and load bearing areas for increased endurance.