Efficient Brake and Clutch Fluid Bleeding: Designed for use with DOT 4 or other common brake fluids, this tool enables fast, one-person bleeding of hydraulic systems without backflow or fluid waste. One Way Check Valve for Air-Free Operation: Features a built-in one way valve that allows brake fluid to flow in one direction only, preventing air from re-entering your brake or clutch system during bleeding.
eBay