See all products of Accessories for units Mounting bracket in stainlees steel for units 165, 166 and 167 series. Female union with captive nut. Sensor holder extension. Safety thermostat kit for units 165, 166 and 167 series. Pair of eccentric tailpieces for units 165, 166 and 167 series. Hydraulic separator kit for units 165, 166 and 167 series. Differential by-pass valve.