Merrill MFG 6-Inch Well Cap - Watertight Sanitary Pitless Adapter Cover, Cast Ir
Used with all pitless adapters. 6" WCI Watertight (Sanitary) Well Cap 3/8" Vent 1" Conduit. 6" I.D. Casing x 6-5/8" O.D. Casing. Well Cap fits 6" I.D. Casing. 6-5/8" O.D. Casing. Material Cast Iron. Thread Size 2.425.