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This Graco 25A875 service kit (Ref. 20, 305, 17, 302 in the parts diagram) is designed for 3300 Industrial aluminum pumps, including diaphragm and backup diaphragm components. The kit contains PTFE diaphragms, Santoprene backup diaphragms, shaft bolt O-rings, a diaphragm install tool, and anaerobic adhesive for servicing your pump.