100 mm (4"), 150 mm (6"), 200 mm (8"), 250 mm (10"), 300 mm (12"), 400 mm (16"), 460 mm (18"), 500 mm (20"), 600 mm (24"), 800 mm (32")
60 mm (2.4"), 100 mm (4"), 150 mm (6"), 200 mm (8")
Pressureless Manways