Suggested Retail:
$95.00

Product Description:

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