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This Graco 100077 hex jam nut is a heavy-duty 5/16 in. replacement fastener used in the priming plate assembly (Ref. 10 in the parts diagram). It is listed for use with the 624939 aluminum priming plate and 965129 assembly, and is associated with nearby parts such as the 156633 O-ring, 100103 cotter pin, and 205647.