TSI Supercool 27361 A/C Flush Gun with Flow Control Valve and Improved Spray Head Use with shop air (adapter included) for maximum pressure and effectiveness Flush cylinder can be pressurized for use even without the air hose attached Effectively removes contaminants, old oils and fluids from the air conditioning system in your car or truck The improved spray head reduces spray back and offers a steady spray Supercool offers one of the most complete A/C maintenance programs in the marketplace