Dual Flush, Sprays Water Into Lines To Clear Out Clogged Pipes, Get 2 Way Jet Cleaning Action With This Unique Holding Tank & Sewer Hose Rinser, Transparent Polycarbonate Fitting Attaches Between Sewer Hose & RV, Then Hooks To Any Standard Water Hose To Create A Powerful Spray That Helps Reduce Odors & Malfunctions In RV Holding Tanks & Hoses.