Ideal Vacuum | ASA 4.25 / ANSI 1 Blank Flange, with O-Ring Groove, Not Bored, Not Rotatable, 4.25 in OD, 3.125 in BCD, Four 0.625 in ID Bolt Holes, 304 Stainless Steel
O-Ring Flange (3" Series)
Oatey 1/4 in. Stainless Steel Toilet Flange Replacement Ring 427782 - The Home Depot
Angle Flange Rings - A&R Corporation
Galv Steel Bauer Type Socket x 150# Flange w/ O-Ring Gasket – US Hose & Coupling