102-004 - DrainJet Professional Hydraulic Drain Flusher - 3" to 4"Petersen Products 102 004 DrainJet Professional Hydraulic Drain Flusher 3" to 4" These drain pipe flushers open clogged drains and sewers with powerful jet action and high flow rate Features Greater flow rate than rubber bulb type flushers that require much of the pressure just to expand the rubber DrainJet & Hydraulic Flushers put all the water flow and pressure to work Easy to install, even around bends and elbows Tough treated industrial fabric