Quick Turn By-Pass Kit The quick turn RV permanent by-pass kit allows you to by-pass your water heater while winterizing and save on antifreeze. This permanently installed system saves you time and money every year. Sturdy brass backflow preventer and 100% shut-off valve. Once permanently installed, this kit allows you to bypass your water heater instantly with the turn of a single valve. Easy to install and designed to last the life of your RV.