Bayliss MK 7 Vent Opener Garden garden trays Shelves fit securely into the

Shelves fit securely into the framework

This easy-built Caledonian Rectangular Raised Bed from Forest Garden is perfect for growing vegetables

The zipped access panel allows easy access for watering

2kW burner

Bayliss MK 7 Vent Opener Garden garden trays Shelves fit securely into theSuitable for use on nearly all greenhouses this Bayliss MK7 is an extremely reliable, British made, automatic vent opener. The bayliss Mk7 vent opener is operated by a stainless steel cylinder containing a mineral wax which expands with heat; this pushes a piston causing the vent to open. As the temperature falls the wax contracts and a strong stainless steel spring closes the opener. Bayliss guarantee their openers for 2 years but if anything should