Mastercool 93518-TP2-way aluminum manifold gauge set with (x3) 18-inch hoses 3 1/8' Gauges (PSI, BAR and F) 1/4' MFL Solid extruded aluminum body Free-floating piston type valves reduce o-ring wearR600a, R290 & R134a 2-Way Aluminum Manifold Gauge Set with (x3) 18-inch Thermoplastic Capillary HosesMastercool is the leading manufacturer of professional quality A/C manifold gauge sets. Mastercools manifold gauge sets are constructed of the finest materials and machined with precision to the highest quality standards. At Mastercool, every manifold they build is built to last.