The magnet extensions can be used with both the SEM 7800 and the SEM1900 magnets.

• To add extensions to the SEM series magnets, you "MUST" start with the 7810-514 coupler kit. The coupler kit provides (becomes) the first 1-1/2" of extension.
• Additional extensions are available in 1/2", 3/4" 1", 2" and 4" lengths that can be combined in any combination to get the required total extension needed.
• The SEM 7800 series magnet extensions have a 3/8-24 thread.
• Maximum extension length for a single door application is 12" (if magnet mounted at top of door). Less if mounted at bottom of door, where it becomes a trip hazard.
• Maximum extension length for an application with a pair of doors is 5". If longer, there is a possibility of the extension on one door preventing the other leaf from closing.