Garden Hose Camlock Coupling Part QYD - A quick & easy way to run two hoses and change between your garden hose and accessories like your sprinkler, watering wands, spray guns etc. The part QYD camlock shown here features two on/off thumb control valves 3/4" female coupler on one end and two 3/4" male adapters with on/off valve on the other end. This camlock part QYD can be attached to the QA portion of coupler at your tap and the other ends with the on/off valve can be connected to either the QB or QD coupler to make it all work.