An integrally-formed sash portlight for installation through a side- wall opening in the cabin or hull structure of a marine vessel has an inwardly-projecting, rectangular, spigot portion within which a rectangular light or screen can be selectively fitted. The spigot portion is provided along the inside top with a side-to-side groove within which an upper marginal edge portion of either the light or framed screen can be received, selectively, and along the inside bottom with a vertically opposed side-to-side seat for the seating reception, selectively, of a lower marginal edge portion of the light or screen, said seat being angularly inclined along its length in the downward direction from inside to the outside, and said lower marginal edge of said light and screen being beveled to the same angle as said seat so as to be in substantially face-to-face contact therewith upon installation in the portlight frame, whereby water impinging on the outside of said light when installed in the portlight frame will be shed downwardly and outwardly of the vessel in which the portlight is installed.
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