Nor-Marine Tank Hatches - A survey of the models:

Model: Swing Away type A - Circular coaming

Model: Swing Away type AC - Semi-Conical coaming

Model: Swing Away type C -Conical coaming

Model: Seatight Tank Cleaning Hatch

Model: Heavy Duty Tank Cleaning Hatch

Model: Inspection (Ullage) Hatch (with flame arrestor/option)