Genuine Beckson replacement O-ring for compatible 8" screw-out inspection ports and deck plates. Designed to replace a worn, stretched, damaged, or missing seal and help restore a secure, watertight fit beneath the threaded cover. Fitment / Sizing Part Number: D8S-G Style: Screw-Out Nominal Size: 8" Approx. Clear Opening: 7-5/8" Required Hole Cutout: 8-1/2" Approx. Outside Flange Diameter: 10" O-Ring Size: Approx. 8-1/2" diameter x 1/8" thick How to Check Your Size Confirm that your existing Beckson deck plate is a screw-out style with a threaded lid. Then check the clear opening or cutout rather than relying only on the outside flange diameter. An 8" nominal screw-out plate has an approximately 8-1/2" cutout and 10" outside flange. If available, also check the underside of the lid or frame for a Beckson model or size marking before ordering.
