Super Recycler (SR4) with OHV Engine (Serial Range 312000001-312999999) Tune-up Kit is customized for specific models and serial numbers only. Please verify your model is listed and serial number is within range. Fits Super Recycler Lawn Mower models 20380, 20381, 20383, 20384. The kit includes the specific blade (133-8183-03), air filter (119-1909), spark plug (BPR5ES) and Premium Oil 18 FL. OZ SAE30 (38916) to perform a tune-up. Genuine parts maintain consistent performance and assure easier installation and proper fit.