TSI Supercool 34412 R-134a Low Side Qwick-Connect Service Coupler For use as a replacement part for R-134a manifold gauges and related service sets Use with blue or red R-134a manifold gauge / R and R machine hoses Replacement hoses for use with manifold gauges are also available for purchase separately Industry leading technology meets or exceeds OEM performance specifications Supercool offers one of the most complete A/C maintenance programs in the marketplace