MFS Supply's In-Line Pressure Test Kit is built for the property preservation contractor to both winterize & de-winterize homes. To winterize a home, use the in-line pressure test kit with an air compressor to blow the water out of the home's pipes and out the faucets. To de-winterize a home, use the in-line pressure test kit with an air compressor to test the pressure of the pipes and identify any potential leaks. This in-line pressure test kit fits majority of outdoor hose bibs, laundry room spigots, and hot water tank connections.