Abstract: Components of a lighting system, exemplified by the lighting system utilized in commercial transport vehicles are protectively housed in a receptacle apparatus comprising an enclosure body, open at one side, a closure or cover member arranged to extend into the open side of the enclosure body and O-ring sealing means, retained in an annular channel in the enclosure body, for detachably securing the enclosure body and closure member in sealed relationship. The closure member is constructed at one end with an outer tapered cylindrical flange, a portion of which is located in abutting relation to a circular end wall extending around the open side of the enclosure body. This arrangement defines a prying aperture in which a tool such as a screw driver may be inserted to pry off the closure member when desired.

Abstract: A tank pressure and vacuum relief mechanism for relieving excess pressure or vacuum in a tank interior. The mechanism includes a housing disposed in a wall of the tank, such housing containing a one-way, normally-closed pressure relief valve for venting excessive pressure in the tank to the atmosphere. The housing also contains a one-way, normally-closed vacuum relief valve for admitting atmospheric pressure to the tank interior to relieve excessive vacuum therein. The mechanism seals completely on tank roll-over at any angle to prevent tank product leakage.

Abstract: A sealed beam lamp shock suppressing retainer ring grommet for quadruplicating lamp life.The dual shocking suppression takes place as a result of the ductile rubberlike material and the cantilever load effect of the lamp on the free end of the grommet.Additional features include weatherproof lamp electrodes, retainer ring and lamp grommet combined as one unit, external ease of changing the sealed beam lamps and a long retainer ring life.

Abstract: A high volume, fluid pressure relief valve for the top of a vent opening in a fluid storage tank. The valve includes a valve member which is reciprocal to and from a valve seat disposed in alignment with the vent opening. Constant force spring means coact with the valve member for normally retaining the valve member in closed condition, whereby the fluid pressure force required to move the valve member remains substantially constant throughout the travel of the valve member. A large venting capacity is provided in a single compact valve device and the valve is so constructed and arranged that pilferage from the storage tank is prevented. Also the valve may include an arrangement allowing "in-breathing" of the storage tank.