Support, Box, Trade Size 1/2 Inch. Use to support FS box, outdoor lighting fixture, or similar devices, per NEC Article 370-23 requirements. Tapered threads (NPT) provide raintight seal and eliminate need for special sealing rings and locknuts. Simply assemble box support onto the box or fixture and fasten to steel 1/2 Inch rigid conduit or water pipe driven into the ground. Zinc die cast with hardened steel screw. Ball burnished, mirror smooth.