ApolloPEX quarterturn supply stops are designed to control water flow to plumbing fixtures ApolloPEX supply stops allow for simple onoff water flow control to faucets, toilets and home appliances Controlling water flow at each fixture allows for maintenance and replacement of fixtures without the need to shut down the entire piping system Designed for use with ApolloPEX crimp rings, stainless steel pinch clamps or stainless steel sleeves all sold separately, various outlet connections allow for the use of supply lines with compression threaded ends