8" Black Inspection Port

Seaworld brand (new June 2007).
Has an o-ring for a water tight seal.
Polypropylene material allows cleanup with acetone.
Overall diameter 259mm (10.3/16").
Opening dia. 203mm (8").
Cut a 216mm (8.1/2") dia. mounting hole.
8 countersunk mounting holes (4mm dia.) centres on 238mm (9.3/8") dia. 

Suitable where regular inspection or access is required on water tanks, kayaks, boat motor wells, wireways, or anywhere you can think of, marine or otherwise.