This main supply hose connector comes with a unique Anti Leak connector system and is ideal for situations where you want to ensure that you dont have a water leak. These work on the same principle as the household MDPE fittings and are ensure a tight fitting every time.These threaded "Y" connectors are used if your going to connect a pop-up sprinkler to a standard hose, i.e. Hozelock Irrigation or Garden Hose.