PROXIMITY SENSOR LIMIT SWITCH, GO SWITCH, MODEL 21, SIDE SENSING, 1 1/2" SQUARE X 3 13/16" OVERALL, SINGLE POLE DOUBLE THROW, STANDARD SENSING 3/8" SIDE SENSING, BOTTOM OF ENCLOSURE OUTLET, 316L STAINLESS STEEL, CSA / FM CERTIFIED EXPLOSION PROOF, 3' LEAD