These are stainless steel, specialty quick connects that are functionally identical, but do not interchange so they can be used where it is necessary to avoid crossing lines. For identification, the 2-HKIG couplers have a white acetal ring and the 2-HKIL have a black acetal ring. They are suitable for use up to 1500 psi and have a standard Buna-N (nitrile) seal.