Part Number: 12321815 (Seat valve) Part Number: 12321818 (Switch,pressure-thermostatic) Part Number: 12321820 (Plate) Part Number: 12321821 (Bearing) Part Number: 12321823 (Defelctor) Part Number: 12321824 (Valve) Part Number: 12321825 (Hardware) Part Number: 12321826 (Linear vlv slide) Part Number: 12321828 (Slide) Part Number: 12321829 (Slide) Part Number: 12321838 (Spring) Part Number: 12321839 (Hardware) Part Number: 12321839-1 (Seal) Part Number: 12321839-2 (Packing)