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The Graco 25R018 Fluid Piston Kit (3:1) is a factory replacement kit containing the spring pin (Ref. 10), steel ball (Ref. 12), O-ring (Ref. 13), 3:1 pump piston (Ref. 33), ball holder (Ref. 34), and compression spring (Ref. 36) shown in the parts diagram. Use it to service the corresponding components in your Graco 3:1 pump assembly.