Dometic SeaLand VacuFlush Vacuum Breaker Repair Kit 385318065Back siphonage is a threat for every boat owner. With the vacuum breakers from Dometic SeaLand, you will create a necessary air gap between water that has entered the toilet bowl and the incoming water supply. This air gap delivers the ultimate protection against back siphonage., Product may vary from image, (uniseal may be black in color) This kit is designed for use with the following models without hand sprayer: 300 500+ 2000 700 800 1000 P N: