The Shimano ST-R9120 Bleed Screw w/ O-Ring (Pair) is an essential replacement for your Ultegra and Dura-Ace STi hydraulic brake/shifters. Designed for compatibility with models ST-R9170, R9120, ST-R8070, and R8020, this genuine Shimano part ensures a perfect fit and reliable performance. Each pair includes O-rings for optimal sealing, making maintenance straightforward and efficient. Upgrade your bike's braking system with these high-quality bleed screws for enhanced functionality.