The JG CTS Shut-off valve ensures an immediate water supply cut-off with a simple turn of the valve handle. The valve is designed to work with both copper and Speedfit plastic pipe. To lock the pipe in place, simply push the pipe into the fitting and turn the nut clockwise. Should the need arise to release the pipe, turn the locking nut anti-clockwise, push the collet towards the fitting and pull the pipe to release.