Camco RV Plastic Blow Out Plug is an essential tool designed to help you clear the water lines in your RV, preventing zing during the winter months or before storage. This handy plug screws into the city water inlet on your RV, allowing you to open all drains and faucets inside the vehicle and then attach an air pump to blow out any remaining water from the lines. By ensuring the water lines are completely clear, it helps protect your RV’s plumbing from damage caused by zing temperatures. This simple yet effective process is a crucial part of winterizing your RV or preparing it for storage, helping you avoid costly repairs down the road. Model Number: 36103