$16.50
The check ball and spring repair kit for the Graco Fusion FX spray gun. Graco names it the Manifold Check Valve Repair Kit, and the kit includes the check ball and spring only.
The exploded parts diagram lists it as a 2-pack, and Graco's catalogue title places it with the filter housing check. It is the kit Graco specifies when the check ball and spring are what need replacing, rather than the complete housing, which keeps a manifold check repair to a small parts order. It is listed for the Fusion FX.
Genuine Graco OEM part 2007204.
