Waterproof tail and clearance light

Claim 1

A waterproof tail or clearance light assembly comprising: a. a base having internal and external surfaces, b. a lamp assembly secured to said base internal surface, said lamp assembly including electrical leads extending through said base to said base external surface, c. a cup-like cap cooperating with said base to form a closed receptacle, d. said base including a shoulder having an upper surface and further including an annular skirt projecting upwardly from said shoulder, e. said base skirt having an external surface and a free end opposite said shoulder, f. said base skirt external surface being provided with an annular rib circumscribing said base skirt and being spaced a short distance from said shoulder, g. said base skirt external surface being further provided with an annular recess circumscribing said base skirt and being spaced from said rib at a position intermediate between said rib and said free end, and h. an O-ring positioned in said recess, i. said cap comprising a lens portion and an annular skirt extending from said lens portion and being in mating cooperation with said base skirt, j. said lens skirt being at least equal in height to the height of said base skirt, k. said lens skirt having an internal surface being slightly flared outwardly, an edge opposite said lens and an annular recess in said lens skirt internal surface adapted to engage said rib, l. a portion of said O-ring projecting outwardly from said base skirt and Being in sealing contact with said lens skirt internal surface, m. said lens skirt edge abutting said shoulder upper surface, n. whereby when said cap is secured to said base, said lens skirt internal surface cooperates with said base skirt external surface to compress said O-ring and render said receptacle formed by said cap and said base watertight.