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Restore your sprayer's fluid section with the Graco 17F145 Fluid Section Rebuild Kit, which includes the Strike Plate (Ref. 4), Shaft (Ref. 5), #331 O-ring (Ref. 17), Wearable Seat (Ref. 19), Ball Retainer (Ref. 20), D-ring (Ref. 21), Check Ball (Ref. 22), Diaphragm (Ref. 25), #117 O-ring Seal (Ref. 32), Bottom Wearable Seat (Ref. 36), Plug Cap (Ref. 37), Glide Seal (Ref. 39), and PFPE Lubricant (Ref. 44). Each component corresponds to its numbered reference in the manual's exploded parts diagram, giving you a complete set of replacement parts in one kit.