Sealey Weighted Motorcycle Brake BleederOne Man Bleeding/Servicing Of Hydraulic Brakes And ClutchesThe Kit Utilizes A Small Weighted Non-Return Valve And A Connector Hose That Attach To The Scooter Or Motorcycle Bleed NippleAs The Brake/Clutch Are Bled The Valve Prevents The Used Fluid And Air Being Drawn Back Into The System