JT4 is a compact, lightweight Pipe cleaning tool for quickly opening clogged sinks, toilets, and tubs. It handles rust, grease, sediment, and scale in lines up through 4" in diameter.

It uses a burst of compressed air that drives a shock wave through water to break up stoppage. And it  has a self-contained pump and pressure gauge, so you can hit the stoppage with just the right amount of force. We suggest you use pressure of 0.3~ 0.4mpa, do not exceed 0.5mpa.If it doesn't work, just try again.