Clear screw in centre and white outer rim.
New August 2008.
Has an o-ring for a water tight seal.
Overall diameter 173mm (6.3/4").
Opening dia. 128mm (5").
Cut a 140mm (5.1/2") dia. mounting hole.
6 countersunk mounting holes (4mm dia.) on 157mm (6.3/16") diameter centres.
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.
Avoid contact with acetone or strong solvents.