Automatically opens and closes the upper louver vent in response to temperature changes. No batteries or electricity required. The piston is coated with a mineral wax that expands with a temperature increase. As the wax cools, the piston lowers and gradually closes your vent. Installs right on the Louver vent.
DripWorks Offers Free Standard Ground Shipping* On All Solexx Greenhouses and Accessories!*Free shipping applies only to Solexx products shipped within the continental US. Excludes expedited shipping and shipments to Canada, AK, HI, PR, and VI. If shipping outside the contiguous US, please call 800.522.3747 for a freight quote.