Brake bleeding has always been an inconvenient and messy job. Commercial shops typically use an expensive pressure bleeder-which, unless used properly, can introduce air bubbles into the system through cavitation. Earl's SOLO-BLEED bleeder screws solve both problems. A direct replacement for the original equipment bleeders, SOLO-BLEED® allows one person to safely bleed brakes without a mess and with no chance of getting air into the system.