Valterra A01-2000BKVP Gravity/City Water Inlet Hatch - Brass, Black (Carded) Lockable hatch 1/2 MPT / 1-1/4" barb connections; 1/2" air vent Outside Dimensions: 7-5/8" width x 6-1/2" height Cutout Dimensions: 5-7/8" width x 4-3/4" height