The Bulldog Antiblast nozzle from Enz USA helps prevent backflow into toilets while jetting in residential areas. It reduces the water pressure through toilets and vent traps, reducing negative pressure arising ahead of the nozzle or excess pressure following the nozzle if the installations are not correct or venting is not working properly. The low-maintenance unit provides streak-free, all-around cleaning. 888/369-8721; www.enzusainc.com.