steel, cadmium plated, 2.875 in. w, 3.062 in. h, four no. 10 /0.190 in./ -32 thd cres screws on 1.875 in. by 1.938 in. mtg centers, marked reset, incl rubber gasket for push-button seal
6.075 in. lg o/a; 0.125 in. matl thk; 0.640 in. dia aperture; six unthd holes, various sizes; five 0.112-40 nc-2b thd holes; two 0.138-32 nc-2b thd holes chromate surface treated