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