Quick view Rotary Corp Fits Briggs & Stratton 392331 & 299745 Chrome Piston Ring Set Rotary Corp brand aftermarket product. Fits models 251000 and 252000; 10 & 11 hp engines. 300420, 301430, 302430 series 12 & 13 hp Horizontal. (Chrome rings). Cylinder diameter 3-7/16".Fits models 251000 and 252000; 10 & 11 hp engines... $83.45 $28.89 Add to Cart