Screw-on inspection hatch, white colour. -- Screw-on inspection hatch, white colour. Diameter of opening 104mm, external 145mm and cutting 115mm. EVAL inspection hatches are made of UV-resistant ABS plastic. So they can also be used outdoors. They have a removable lid and, thanks to the special thread, they open very easily and can be automatically withdrawn by performing a 900 turn to the left. This makes it easy to access and work in various areas of the boat. The slots screws of the EVAL inspection hatches are covered and the hatches also include a seal, to ensure a perfect seal.