<https://www.valterra.com/product/gravity-plastic-city-water-inlet-hatch-black-bulk-2/#product>
<http://schema.org/description>
"* Gravity/city water inlet in lockable hatch\r\n\r\n* 1/2\" MPT / 1-1/4\" barb connections; 1/2\" air vent\r\n\r\n* Cutout: 5-7/8\" W x 4-3/4\" H\r\n\r\n* OD: 7-5/8\" W x 6-1/2\" H"
<https://www.valterra.com/product/gravity-plastic-city-water-inlet-hatch-black-bulk-2/>