Camco's RV Fresh Water Blow Out Hose with Ball Valve is a winterization tool that aids in the removal of water from your water lines and eliminates the need to use expensive antifreeze. It is ideal for boats, RVs and sprinkler systems. This kit includes a flexible, 6-inch hose with ball valve and durable brass fittings. The flexible hose can access tight spaces and reduces strain on your pipes and fittings. The ball valve allows you to control the air flow rate. Easy to use, simply attach the barbed fitting to the air compressor quick connect hose and the ¾-11 ½ NH male garden hose fitting to your RV or boat's city water inlet.