Fiamma 94715-005 Gravity Fresh Water Fill Inlet – BlackMost trailers have a gravity fill inlet which allows you to fill the fresh water tank by loosely fitting the water hose to the fill inlet. Water should be turned on at a slow flow rate, allowing gravity to pull the water through the fill hose (not included) and into the fresh water tank.Additional InfoOverall Diameter4-3/8″Cut-out Diameter3-1/8″Mounting Holes3-1/4″ to centerBarbed Connection1-1/2″MaterialPlasticColorBlack