Accepts either 1-1/4" or 1-3/8" water fill hose. Has a tank vent connection. Direct OEM replacement. UV and impact resistant. Resistant to road salts and acids. Paintable. Cutout Dim: 3-1/2" dia. Outside Dim: 4-1/2" dia. Dish Depth: 3/4". Spout Depth: 2-1/2".