Royal Victorian Automatic Opener for Roof Window
$95.00
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For Royal or Junior Victorian Greenhouses: the black tube is filled with special paraffin 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! Specifications: Fully automatic - no electricity needed! Opens to approx 14" Black color
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$90
$95
(+$5)