Product Description - Dummy plug for Dura-Ace The is a dummy plug for the shift/brake levers (10-speed) of the first generation of the Dura-Ace Di2. It can be used to seal unused Di2 connections. Subsequent Di2 series are not compatible. Compatibility:Dura-Ace Di2 ST-7970Manufacturer Number:Y-6RX32000 Contents:1 x Shimano dummy plug Manufacturer: Shimano Europe B.V. High Tech Campus 92 5656 AG Eindhoven Netherlands info@shimano-eu.com