with glass underneath for Royal Victorian Greenhouses
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 the temperature falls a heavy spring pulls the window closed. No electricity is needed!
A manual opener that works like a large threaded screw - for Royal or Junior Victorians (please note if the long handle is needed)
Mounted underneath roof window. Includes a slot/brush "seal" opening for the window opening device'
20 Stainless Steel hammerhead bolts and nuts - can be inserted in the channels in any of the aluminum frame profiles - turned 90º - these to attach accessories such as shelving later.
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