*100% Teflon diaphragms * Manifold sight glass * 60" hoses (Bridgestone) * Works with most refrigerants * unique swivel design reduces wear * excellent vacuum characteristics * 100% virgin teflon diaphragms * full porting for maximum refrigerant flow * industrial grade replaceable brass fitting * anodized aluminum block body * one full turn open/close valve * overglass sightglass for easy viewing * no-flutter gauge design * easy-to-grip knobs * Includes snap couplers To make this EPA approved, purchase #3368 Inline Gauges