Pemko 420APKL Automatic Door Bottom, Black PemkoPrene Insert, 1-3/8" Width, 13/16" Height, Mill Finish Aluminum

The Pemko 420APKL Automatic Door Bottom delivers reliable sound and draft control by automatically dropping a sealing element as the door closes. Built with a durable mill finish aluminum housing and a black PemkoPrene insert, this concealed drop seal measures 1-3/8" in width and 13/16" in height, making it a clean solution for commercial and residential openings. As the door shuts, the plunger contacts the frame and lowers the seal against the threshold, blocking light, sound, and air infiltration. When the door opens, the seal retracts automatically to prevent floor drag and wear, offering consistent performance over time.

Features

• Automatic drop-down seal activates as the door closes to block drafts, sound, and light.
• Durable mill finish aluminum housing built for long-term commercial use.
• Black PemkoPrene insert provides an effective, resilient sealing surface.
• Compact 1-3/8" width and 13/16" height for a discreet fit.
• Automatic retraction on opening reduces floor contact and extends seal life.

Functional Details

The 420APKL uses a spring-loaded plunger mechanism that engages the strike side of the frame when the door closes, driving the concealed seal downward against the floor or threshold. Opening the door releases the plunger and lifts the seal back into the housing.

• Automatic door bottom.
• Extruded aluminum housing with PemkoPrene insert.
• Adjustable end brackets for surface or mortise mounting.