DP5 Protek Repair Kit D05RK Includes: D0004Check Valve (Disk) D0054 Diaphragm, D0303 (DP5 only)Diaphragm Plate (2 req.), D0340Drain Valve, X0D04¼-20 x 1″ Bolt (4 Req’d), X0D10³/8″ Flat Washer (2 req.), X0D11Jam Nut (2 Req.) X0D12¼-20 Self Locking Nut (4 Req.) MAINTENANCE: Remove any debris under the diaphragm after each use. Clear all fluids from inside the unit after each use. TROUBLESHOOTING: If the Diaphragm Primer is not priming the pump, check the following: Make sure drain valve is closed. Inspect check valve for blockage and free movement. Any debris can cause clogging, or prevent the valve from sealing properly. Connecting hoses should be straight and clear of debris. Check suction side for air leaks.