The Spacer Appliance reduces the working range of the Mighty Magnets by approximately 3/8”. For example: if the Mighty Magnets you have are rated for a working range of  ½” to 1” thick tank walls, and you add the Spacer Appliance, the Mighty Magnets will now work on ¼” thickness as well. Spacer Appliance (D) is compatible with Mighty Magnet models F-10, F-12, F-14, F-15, F-16, F-17, FF-10, FF-12, and FF-14.

Dimensions: 3-5/8″ x 5-3/4″ x 3/8″ thick. Actual product and color may differ from picture.

Always clean, inspect, and test products in an inconspicuous area of the aquarium.