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Easy to fit - Simply undo the two grub screws, replace the old cylinder with the new and replace the screws, without any need to remove the opener itself.

Dimensions - 8" x ľ" diameter (20cm x 2cm)

Specifically designed to fit the Rion Window Opener.

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How it works.
The black cylinder contains a wax like substance which expands with heat. This pushes a piston which opens the vent via a metal arms linkage. As the temperature drops the wax contracts, therefore reversing the process and closing the window.