Decdeal Window Opener, Greenhouse Automatic Temperature Controlled Window Opener Auto Solar Heat Sensitive Greenhouse Vent Opener with Cylinder, Lifts 7kg/15lb, Double Spring

⭐【More Reliable and Stable】Compared with the single spring vent opener, the double vent opener has stronger thrust force, more solid, and much durable. Universal fit for all aluminum frame greenhouse. The double spring window opener can be closed manually.
⭐【Auto Adjustment】Solar heat sensitive vent opener, automatic stretch or shrink the vent while the temperature is changing. Auto-opening temperature range is adjustable from 15-25℃(60-77℉) by turning the cylinder. (Clockwise for higher, counter-clockwise for lower)
⭐【High Weighting and Big Opening】Vents weighting up to 7kg/15lb. Maximum opening at about 30℃/86℉(depending on adjustment and load).
⭐【Lustrous, Durable and Rust-proof】Elongated aluminum cylinder with paint spraying, weather resistant. Aluminum frame looks more lustrous, durable and rust-proof. Stainless steel accessories would last long time use.
⭐【Multi-function】Great for variety of occasions, home, office, farm, botanical garden, railway and greenhouse.