Conduit wiring system. Four 1/2 in conduit knockouts (sides). Two 1/2 in conduit knockouts (end). Two 1/2 in conduit knockouts (bottom). Less clamps. 3 in x 2 in x 2-1/2 in D. 12.5 cu-in. Acceptable for use in 2 hrs rated fire walls. UL listed.
