This repair kit includes genuine Tetra replacement parts for the TetraTec Deep Water Aquarium Air Pump Model DW 18.  Repair Kit Includes:  Repair Kit Wrench, 1 Diaphragm Assembly (with screw, washer and nut), 2 Rubber Retaining Plugs, 2 Silaflex II Valve Flappers, 1 Rubber Armature Hinge, and 1 Rubber Washer.