Jonsered 2171 Piston Assembly No. 503-69-14-71. This is an aftermarket 47mm piston assembly for the Jonsered 2171 chainsaw. This kit includes piston, ring, wrist pin and cir clips. Replaces Jonsered chainsaw part numbers 503691471, 503 69 14-71 and 503-69-14-71. This does not fit the Jonsered 2171EPA cylinder that has two piston rings.