Mastercool is the leading manufacturer of professional quality A/C 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. This Dual R134a/R12 2-Way Manifold Gauge Set includes: 3 - R134a nylon barrier hoses, 3 - R12 nylon barrier hoses, manual couplers, 3-in-1 side mount can tap valve and is packaged in a custom molded carrying case