Automatic Window Control Mechanism - no power needed - Automatic Window Control Mechanism - no power needed -

Gas-filled. Entirely self-contained (no power needed), the device extends in the heat of the sun and opens up the cold frame. As soon as it becomes cooler, the device closes it up again.

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The best price found is £39.99 from Westfalia Mail Order.

Stockist Catalogue Product Name Price
Westfalia Mail Order Automatic Window Control Mechanism - no power needed - £39.99