GANOPPER 100mm Long Seatpot Shim 22.2 25.4 26.6 27.2 to 28.6 30 30.4 30.9 31.6 31.8 33.9 34.9 36 Alloy Bicycle Seat Post Tube Adapter 25.4 I.D./26.6 O.D. bee04 Dual Filtration System: The carbon

Dual Filtration System: The carbon filter helps purify the water and eliminate bad odors

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GANOPPER 100mm Long Seatpot Shim 22.2 25.4 26.6 27.2 to 28.6 30 30.4 30.9 31.6 31.8 33.9 34.9 36 Alloy Bicycle Seat Post Tube Adapter 25.4 I.D./26.6 O.D. bee04 Dual Filtration System: The carbonGANOPPER 100mm Long Seatpot Shim 22. 2 25. 4 26. 6 27. 2 to 28. 6 30 30. 4 30. 9 31. 6 31. 8 33. 9 34. 9 36 Alloy Bicycle Seat Post Tube Adapter Product Features Feature: Use this seatpost adapter, 25. 4 mm Seat Post can be converted to 26. 6 26. 4 26. 8 seatpost,seatpost shim can help you change the bicycle seat tube outer diameter to meet your needs Material: 25. 4 Bike Seatpost shim is made of high quality 6061 aluminum alloy, CNC machining CD