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Janssens Automatic Opener for Louvre Window

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Janssens Automatic Opener for Louvre Window

In stock (can be backordered)

$79.00

In stock (can be backordered)

Product Description:

Automatic Opener for Louvre Window for Royal or Junior Victorian Greenhouses: the black tube is filled with special parafine oil - which expands when the temperature reached around 72º and the piston will push the window open up to about 14". When temperature falls a heavy spring pulls the window closed. No electricity needed!

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