A hydraulic component for braking systems and/or clutch drives may have at least one connector and an eyelet. The component may also have an inlet plug that brings fluid into the block. The component may also have at least one upper seal interposed between an upper surface of the eyelet and a head of the inlet plug. The component may also have at least one bottom seal interposed between a lower surface of the eyelet and a base of the block. Between at least one of the upper and lower surfaces of the eyelet and the corresponding head or base a protuberance is interposed, so that in the absence of the corresponding seal, the protuberance creates an interspace allowing the leakage of fluid.