DeGray Lake Resort State Park DeGray Lake M41029 Pack of 25 Retainer Piston Pins Fits John Deere 444D 301A 302 310 350B. Pack of 25 New Aftermarket Replacement Retainer Piston Pins Fits John Deere Industrial, Construction, and Agricultural Models This pack of 25 aftermarket replacement piston pin retainers (also called piston pin snap rings or circlips) secures the piston pin in place within the piston bore, preventing lateral movement and maintaining proper alignment between the piston and connecting rod. These retainers are used in Fits John Deere 2. 9L diesel (3029) and 300 Series diesel engines found across a wide range of Fits John Deere (Fits JD) industrial, construction, and agricultural equipment. Sold as a pack of 25 individual retainers. Compatible Models Fits John Deere Industrial Construction: 301A, 302, 310, 350B, 350C, 350D, 355D, 444D Fits John Deere Agricultural Tractors: 1040, 1140, 1350, 1530, 1550, 1630, 1750, 1850, 2040, 2330 Replaces Part Number(s): M41029 New aftermarket replacement part not remanufactured, not used.