Juliana Greenhouses Greenhouse Univent Window Opener
JU1055 Features: Made for use with polycarbonate greenhouses Spring loaded Allows thermostatic control of roof vents Note: Take care to remove the cylinder during periods with frost as the openers may try to open the windows when the sun warms up the cylinders. If the windows are frozen, this may cause the cylinders to burst due to their demand for getting rid of their surplus energy.. Price: $71.99
This item is available from Walmart
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