Install this simple kit between your fresh water holding tank and your pump. It provides a slick way to bypass your holding tank and get nontoxic antifreeze throughout your water lines with just a turn of a brass valve using your water pump. It will save you a ton of antifreeze. Using antifreeze during winterizing is essential. Blowing out the lines alone is not enough to protect traps and valves. For instance, if you have a Sealand toilet, the flush valve must be winterized with antifreeze or you must remove it and drain it. Using some antifreeze is the fastest way to go. Kit fittings have NPT connections. If you have an older pump that requires flare connections, you will need to adapt.