High quality -- High-quality replacement cylinder for greenhouse window automatic openers or auto vent, as they are commonly called.
Universal -- Compatible with most greenhouse window openers with either single or double springs.
Solar Energy -- Uses solar energy to heat the cylinder. Open or close the greenhouse vents as temperature rises or drops, helping to maintain optimal growth conditions in your greenhouse.
Replacement cylinder only -- A replacement cylinder for greenhouse window opener. Full set of auto vent opener is not included.
Simple installation -- Simple DIY installation without obstacles!
