AFCO Door Components help to seal up your door. Products include door sills, thresholds, weatherstrip, door bottoms.
Hager Companies offers a complete line of thresholds and weatherstripping products for virtually any type of door application.
M-D Building Products
M-D Building Products offers a wide selection of door sweeps, thresholds, doorjambs, door bottoms, and drip caps to weatherproof doors. In addition, they offer push and kick plates and screen door grills.
Randalll Manufacturing has a varierty of door accessories: from door sweeps, thresholds and weather striping, to kick and push plates.
Strybuc offers a variety of door components including thresholds, door bottoms, and weatherstripping.