The Thetford 94218 City Fresh Water Dish Inlet from B&B Molders features a recessed inlet without hatch and a 3-1/2 inch cutout size, with a 4-3/4 inch outside diameter and 3/4 inch dish depth, plus a 2-1/2 inch valve depth. Additionally, it boasts a lead-free brass check valve with 1/2 inch male pipe thread, plus UV and impact resistance. Certified by IAPMO, NSF, CSA, and TEI, this single, B&B cross referenced 321-B-26-A Polar White inlet is an ideal choice.