R-12 and R-134a. Manual shut off valves. Manual style, high quality couplers . Large 2-1/2in. gauges with gauge protectors. Includes (3) 72in. barrier hoses Mastercool is the leading manufacturer of professional quality A/C-R manifold gauge sets. Our manifold gauge sets are constructed of the finest materials and machined with precision to the highest quality standards. At Mastercool, every manifold we build is built to last!