VETUS MAGNUS Ventilation Hatch - OD 12-5/16" x 12-5/16" [MAG2626SL]MAGNUS Ventilation Hatch OD 12 5 16" x 12 5 16" Heavy Duty Ocean Hatch MAGNUS is a complete range of extra heavy duty hatches. They are CE classified AI, which means to say that they are designed for ocean use and can be fitted in any part of the hull or deck. These hatches are provided with friction hinges, which will keep the hatch open in any position, without the need for stays. The hatch can be opened through 180 and there are virtually no