This camping accessory clears water from your RV's lines, protecting your pipes from cracking in freezing temperatures and ensuring your RV anti freeze performs effectively. With a Schrader valve, the plug easily attaches to your RV's city water inlet and works with most air compressors. Using it is simple: screw the RV blowout plug for winterization into your travel trailers city water inlet, open all faucets and drains, and connect your air compressor. The compressed air quickly flushes out any leftover water, protecting your plumbing system from costly freeze damage during the RV winter season. Durably constructed, this camper accessory is designed to perform reliably every year.