ENVE Seatpost Battery Retention Plug 30.9mm and 31.6mm Posts

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From BikeTiresDirect

The ENVE Seatpost Battery Retention Plug. Securely holds your Shimano Di2 battery in Enve Carbon Seatposts. Available in three sizes 25.4mm 27.2mm and 30.931.6mm size. | ENVE Seatpost Battery Retention Plug 30.9mm and 31.6mm Posts