I use it when I bleed my brakes myself. Stick this on the bottom with some clean brake fluid, inflate the pedal, everything is simple and clean. Or if you bleed the brakes with a helper, the brake fluid doesn't splash in your face. this happens quite often even if you are careful. Though I'll say this, an Eric on YouTube who studies witches created this very device using a 20-ounce pop bottle and plastic tubing.
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