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- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 14 - Jul 19
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Description
Speedwellstar Heavy-Duty Auto Greenhouse Window Vent Opener - Twin Double Springs Lifts Up to 15kg – Solar Heat Sensitive Automatic Kit15kg Load Capacity Effectively supports greenhouse windows up to 15kg for reliable ventilation Heavy Duty Twin Springs Designed for durability and strength, making it perfect for long term greenhouse use Temperature changes in your greenhouse will trigger the opening device, the working conditions are Start to open 15c 23c (59f 73f) Fully open temperature 35 (19f) or above Fully open distance 45cm (18") Maximum opening weight 15 kg Can be clipped or
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
Based on 655 reviews
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Product Reviews
★★★★★ 5
Ergonomic good, material so, so
Size: Large, Color: Wishbone
Nice ergonomic, but the plastic come off and dog chew it. I had rather have a stronger material adequate for bigger dogs.
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Reviewed in the United States on April 30, 2026
★★★★★ 3
Love it, nice for tough chewers, split in half during play
Size: X-Large, Color: Textured Ring, Size: X-Large, Color: Textured Ring
LOVE THIS PRODUCT, would’ve gotten 5 stars but i threw it for my dog and it split in half on contact with the floor. It had lasted us well over 5 months, it’s not his favorite toy but he’ll pick it sometimes, i wouldn’t say it’s unsafe in half just don’t give the smaller parts!
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Reviewed in the United States on December 18, 2025
★★★★★ 5
Dogs love them
Size: X-Large, Color: Textured Ring
Great for aggressive chewers . hold up well
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Reviewed in the United States on April 26, 2026
★★★★★ 5
Great for power chewers
Size: Large, Color: Bundle
Nothing beats Nylabone!!! Our lab has destroyed everything else… even the extra durable black kongs. Finally a chew toy that is super durable and great size.
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Reviewed in the United States on June 12, 2026
★★★★★ 5
Dogs love them
Color: GT-2P
I have 5 large dogs and they love their chew toys but are picky and tend to tear up the ones they like. These large bones are perfect for my 70 - 90 pounds dogs and are almost indestructible. Most chew toys last a day with them these have lasted a couple of weeks and show no sign of being destroyed anytime soon.
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Reviewed in the United States on June 11, 2026