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Graco Carbide Seat Kit part#: 246429. Kit includes part#: 15C011 ball guide, part#: 105445 0.5" ball, part#: 15B112 0.941" o-ring packing, and intake seat. Item comes as seen in pictures.

Graco High Quality OEM Inlet Valve Seal Repair Kit 246429 for Graco Ultra series - B008BVU7OY