See all products of Accessories for regulating units Spare parts for regulating units code 1715.5A2L. Actuator for mixing valve. UPM3S Auto 25-60 spare part. Pocket. Pair of fittings with seals for connection of 182 series groups to 670 and 671 series manifolds. Pair of fittings with seals for connection of 182 series groups to 662 and 664 series manifolds. Box for manifolds 662, 671 and 668...S1, 664 and 665 series and regulating units 182 series. Differential by-pass kit with fixed setting 25 kPa (2.500 mm w.g.). Adjustable thermostatic mixing valve with knob.