Bleeding your brake or clutch line has never been easier or simpler! Revolutionary double-patented Russell Speed Bleeder replaces the original bleeder valve in your caliper/wheel cylinder with a spring-loaded one-way ball and check valve design. This unique design opens to allow the old fluid and air out, then closes automatically between pumps to prevent the old fluid and air from re-entering the line. It's a real time saver! * Makes bleeding brakes a one person task * Available to fit virtually any hydraulic brake or clutch system * Sold 2 per package and offered in both metric and standard sizes * Uses OEM style sealing area to guarantee a positive leak-proof seal * Dust protection cap is standard with each bleeder screw * Speed bleeders permanently replace original bleeder screw