To connect a garden hose to your city water and/or tank filler hook-up box, you will need a female coupling for the end of your garden hose. Most of the garden hose quick-disconnects on the market are universal; therefore, if you already have one, it will most likely work. HOWEVER, the one we offer is particularly nifty, because it has an auto shut-off feature: when you pull it off your hook-up, the water flow STOPS. Yes, it's just as awesome as it sounds.
NOTE: If you are ordering our the GoWesty-designed complete hook-up kit, this coupling piece is included (so don't order an extra, unless you really want one!).