OBLÒ Inspection porthole or liquid level Ø 148 mm.
Made of aluminium light alloy with tempered glass; supplied complete with gum washers, anchor screws and O-ring.
For the tightening to build a central hole of 148 mm and 8 threaded holes M6 arranged 45° on a diameter with inter-axis of 180 mm.
The thickness of the reservoir must not be less than 5 mm.