Sierra 18-4621 2 Ring .015 OS Bore Inline Piston Kit

Replaces OEM part #MERCURY MARINE 780-9229A10. For:40-50 HP; 4 cyl; 2.580/.015 bore. Contains:18-4621 Piston - replaces O.E.# 780-9229A1018-3967 Piston Ring - replaces O.E.# 39-18653A1 Wrist Pin ( Not Sold Separately)18-4294 Circlips - replaces O.E.# 40-52035