Self-discharge through the underside of the doors can be minimised with the installation of a door threshold from the bottom to the top in combination with a smooth. This combination provides a weatherproof seal between the bottom of the door and the top of the threshold. Drip caps offer your exposed entry possibilities, protection by draining water from the door below and thresholds. m-d Building Products offers several combinations of new and dripping replacement door trousers and caps, suitable for most entrance doors.