Replacement rubber cap for HOPE caliper bleed screw, part number HBSP240. The cap is primarily used to keep debris out of the brake caliper hydraulic system. The cap keeps the bleed screw free of dust, mud, and other debris that could settle in its cavity. This makes it very easy to bleed the brake at any time. If you have lost the original cap, it can be easily replaced. The cap is compatible with almost all HOPE brake calipers.