INDOOR | For Reverse Service (Generator Applications) | Furnished With Connection Block for Easy Wiring; Unitized Construction Reduces Installation and Maintenance Costs; Shock-Absorbing Porcelain Socket for Longer Lamp Life; Neoprene Rubber Ring in Neck of Reflector Snaps Into Groove of Mounting Hood - Protect | Use Through Knockout to Connect Box to Conduit Coupling; Use With a Locknut to Connect Two Boxes Side by Side or Back to Back; Use With a Locknut to Connect Fixture Housings in Continuous Runs; Rigid Conduit Threads (Nps)Furbay Electric Supp