Garden Tool Single Spring Automatic Greenhouse Window Opener Solar Heat Sensitive Garden Ventilatio

1. Fully automatic greenhouse ventilation2.Heat activated3.Fully adjustable to open between 15-25 (60-77 )4.Suitable for windows up to 7kg( 15lbs )5.Easy fitting by or screws provided6.No batteries or electricity required7. with spring. 8. with the automatic window openers, you can be of an even temperature in your greenhouse day and night. They allow thermostatic ventilation control through the roof windows of your greenhouse. 9. Replacement cylinders are available.Colour:blackMaterial:aluminum alloyPackage Contents:1 x Automatic Window Opener kitOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.