Bayliss MK7 Hydraulicheck Greenhouse Window Opener
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- Designed to open your greenhouse window automatically
- It works by a wax within the cylinder of the opener expanding when it's hot, pushing a piston to open the window
- When it's cool, the was contracts and stainless steel springs close the window
- Suitable for aluminium or wooden greenhouses
- Supplied complete with easy to follow instructions for simple installation
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