$237.50
This is the round pattern mix chamber for the Graco Fusion AP air purge spray gun, in the 0.086 in orifice size. Graco identifies it as size 05, and the exploded parts diagram lists it as the mixing chamber with a 0.086 orifice size, 05.
Mix chamber sizes are not interchangeable, so work from the code: 05 is the 0.086 in chamber, the largest orifice in the Fusion AP round range shown here. Check what your gun is set up with before ordering, and if you are stepping up in size, order the chamber the job calls for rather than a straight swap.
This chamber is listed for the Fusion AP. Genuine Graco OEM part AR8686.