SET OF 5 - Replacement Air Filter for Shindaiwa # 20000-81740 Fits T25 & T20 - B1SB5864 Fits Green Machine model 3000S and Shindaiwa models T25 and T20. Fits our B1WE229- Air Cleaner Assembly. Measures approximately: 3/8" H, 2-3/8" OD. This is an Aftermarket part. Thanks for looking!