These heavy duty units feature a heavy cast aluminum housing with 1/4" thick aluminum cover plates and 0‑ring seals. Heavy duty bearings are double‑sealed and allow radial shaft loading of 40 lbs (18 Kg). A 1/2" (12.7 mm) NPT Conduit entry permits signal wiring to be run via flex‑conduit to an internal terminal block. Electrical characteristics are identical to those for the Model ZBG. Terminal board markings correspond to the Pin‑Out identification of the ZBG.