The JR Products City/Gravity Water Hatch accepts either a 1-1/4" or 1-3/8" water fill hose. Lead free brass city check valve with 1/2" MPT. Both UV and impact resistant, it is also resistant to road salts and acids. Cutout Dimensions: 4-3/4" H x 5-7/8" W. Outside Dimensions: 6-1/2" H x 7-5/8" W. Collar Depth: 1-1/2". Total Depth: 3-1/4".