The Aqua Signal Series 41 masthead navigation light (25 W) is a compact light. It is type-tested and approved by the BSH for ships under 20-m long. It is made from impact- and shock-resistant plastic and is dust-resistant, water-resistant and sea-water-resistant. This light is fastened using two screws in the rear wall and connected with 2 blade receptacles. Protection: IP 55, Minimum visible distance: 2 nautical miles; Masthead light: 3 nautical miles; Dimensions: 9.2 x 10.5 x 8.2 cm.