Below you will find brief information for 90066-EX-HOSE, 90068-EX-HOSE. This exhaust hose assembly is designed for use with Mastercool "Black Series" vacuum pumps. It helps vent exhaust fumes in tight spaces, which is especially useful when handling A2L and A3 flammable refrigerants. The assembly includes parts like a clear plastic hose, stainless steel clamps, and a vacuum pump exhaust. It should be connected to the vacuum pump exhaust port and the hose end exhausted to a well-ventilated area.