In Aqua Signal Series 41 lights, except for all-round lights, the lens and housing are molded together as part of the manufacturing process. The lens/housing assembly does not include the bulb, socket or securing ring.
In Aqua Signal all-round lights, a replacement lens includes the top cap
Part #407101 is a tri-color and white lens and top cap, with a black housing, for a Series 40 tri-color/anchor and/or strobe light