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.
National Guard Products
The thresholds seal the door against air, dust, water and sound.
Randalll Manufacturing has a varierty of door accessories: from door sweeps, thresholds and weather striping, to kick and push plates.