Mastercool introduces its new exhaust hose assembly to be utilized with all Mastercool “Black Series” vacuum pumps. When working in tight quarters with minimal ventilation, the Mastercool exhaust hose assembly can be used to vent exhaust fumes by redirecting them to an exterior location. This assembly may be used with all vacuum pumps but is highly recommended when servicing systems running on A2L and A3 flammable refrigerants.