Winterize Mfg Heavy-Duty Quick Connect Blow Out Plug for RV, Travel Trailer, Boat and Camper Clear the water lines of RV's, travel trailers, boats, and sprinkler systems to protect from freezing temperatures Single person operation - easy and simple to use - locks in place - just attach and walk away Milled from single solid piece of aircraft high quality aluminum - strong, durable, corrosion resistant - drinking water safe Industrial quick-connect compressor fitting (most common style produced allowing max air flow) will attach to any 1/4" universal coupling Can be attached to anything that has a female garden hose thread