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PACK OF 1. The Comet BP171 Repair Kit (5026.0145) comes with all the necessary parts and components in order to fix and repair your existing Comet BP171 Diaphragm Pump. The kit includes 4 Buna Diaphragms (1800.0002), 1 Accumulator Diaphragm (1800.0034) and 8 Valve Assemblies (1220.0046).