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Core technology is the hydraulic cylinder that contains a plant-based special wax that works as the opener thermostat: No need for electrical power supply. Note: for j. Orbesen teknik directly as instructed in the images for replacement.

Cylinder replacementthis is a replacement cylinder for automatic window opener. Notein order to ensure a good use experience, this cylinder need to be refrigerated before use it.
Automatical designthe automatically adjusted temperature is 15 to 25°C. As the temperature changes automatically, the greenhouse vent opener cylinder can maintains the best growing temperature and prevents your greenhouse from overheating. High qualitythis greenhouse vent opener cylinder is made of quality material, durable, solid and convenient to use.



Noticethis solar heat sensitive greenhouse opener need to be refrigerated before use it. Working theoryas the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating.

Tips : do not use this opener anywhere the temperature will exceed 45° 122F. Solar energy : non-electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops.

Working conditionthe maximum height of the open window is about 45 cm 18 inches. Tips:note: do not apply excessive loads by locking or covering window. The automatic ventilation window opener in the greenhouse cannot be used in an environment with a temperature higher than 50°.


As the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating. Great functionthis window openr can prevent greenhouse overheating well as you want.

Save your energy and time, instead of electric, and no need for human operation.
Co2 friendly:the window opener will be very environmental and CO2-friendly throughout its whole lifetime because there is no need of electricity in your greenhouse. Automatic design:the automatic window opener opens and closes your greenhouse window as the temperature changes automatically, maintaining the best growing temperature and prevents your greenhouse from overheating.
1. J. Orbesen Teknik Standard Hydraulic Cylinder
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Thermovent, Ventomax, & Sesam Liberty Window Opener, Optivent, Standard Hydraulic Cylinder Replacement for Univent
#adJ. Orbesen Teknik Standard Hydraulic Cylinder #ad - Orbesen teknik, not interchangeable with any other brand AND NO RETURNS to Amazon, denmark, Products ONLY, contact J. Replaces worn out piston rod from your J.Core technology is the hydraulic cylinder that contains a plant-based special wax that works as the opener thermostat: No need for electrical power supply. Note: for j. Orbesen teknik directly as instructed in the images for replacement.
More information #ad
Our renowned hydraulic cylinders replace our small range of window openers: Optivent, Sesam Liberty Vent, Thermovent, Univent, and Ventomax. You don't need any electricity in your greenhouse; the window opener will be very environmental and CO2-friendly throughout its whole lifetime. Orbesen teknik Brand Denmark Univent Window Openers.Brand | J. Orbesen Teknik Standard Hydraulic Cylinder #ad |
Manufacturer | J. Orbesen Teknik ApS #ad |
Height | 0.59 Inches |
Length | 7.87 Inches |
Width | 0.59 Inches |
Part Number | C00-0000-100 |
Model | No. 1 |
Warranty | Manufacturer warranty for 1 year from date of purchase. |
More information #ad
2. AYNEFY
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AYNEFY Greenhouse Opener,Vent Opener Cylinder and Solar Sensitive Automatic Roof Hydraulic Cylinder for Window Openers Univent Vent Opener
#adAYNEFY #ad - When the temperature exceeds 25 degrees, the window regulator will remain open. Solar sensitivenon-electric, the greenhouse vent opener cylinder uses solar energy, open or close the greenhouse vents as temperature rises or drops.Cylinder replacementthis is a replacement cylinder for automatic window opener. Notein order to ensure a good use experience, this cylinder need to be refrigerated before use it.
More information #ad
Do not use this opener cylinder anywhere the temperature will exceed 50° 122F. It is ideal for your greenhouse window--opens and closes your greenhouse window. Automatical designthe automatically adjusted temperature is 15 to 25°C. As the temperature changes automatically, the greenhouse vent opener cylinder can maintains the best growing temperature and prevents your greenhouse from overheating. High qualitythis greenhouse vent opener cylinder is made of quality material, durable, solid and convenient to use.
Brand | AYNEFY #ad |
Manufacturer | AYNEFY #ad |
Height | 0.63 Inches |
Length | 12.01 Inches |
Width | 0.63 Inches |
Part Number | Letaer765fdth3ke |
More information #ad
3. A ANLEOLIFE
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A ANLEOLIFE Replacement Cylinder for Automatic Vent Opener Temperature Controlled Window Snap Grow Greenhouse Acessories Hydraulic Cylinder
#adA ANLEOLIFE #ad - Screw directly into polycarbonate panels, wood, or metal frames. Auto open/closed. The greenhouse window opener does not consume any power, no batteries or electrical power needed.More information #ad
Brand | A ANLEOLIFE #ad |
Manufacturer | A ANLEOLIFE #ad |
More information #ad
4. Yosoo
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Gardman & B&Q Vents, Yosoo Replacement Window Opener Auto Vent/Automatic Greenhouse Cylinder for Orbesen
#adYosoo #ad - Also suitable for Orbesen, Gardman & B&Q vents. Important notice:do not use this opener anywhere the temperature will exceed 50° 122F. Non electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops.More information #ad
This listing is a replacement cyLINDER only, for the full set of auto vent opener you can find it in my shop.Brand | Yosoo #ad |
Weight | 0.09 Pounds |
Part Number | GOMUKASINSUD38034 |
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5. POCREATION
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Automatic Window Opener,Carbon Steel Greenhouse Window Automatic Roof Vent Opener Replacement Cylinder Temperature SensorBlack
#adPOCREATION #ad - Adjustment follow the tempNon-electric, uses solar energy, greenhouse opener cylinder open or close the greenhouse vents as temperature rises or drops.Noticethis solar heat sensitive greenhouse opener need to be refrigerated before use it. Working theoryas the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating.
More information #ad
Applicationthe automatic greenhouse window opener is Ideal for your greenhouse window and planting more out of season crops projects. Reliable qualitythe greenhouse vent opener is made of quality material, features very durable in use, solid and convenient to use.Brand | POCREATION #ad |
Manufacturer | Floverd #ad |
Height | 0.79 Inches |
Length | 14.17 Inches |
Width | 3.94 Inches |
Part Number | 9w5f3sn8vg |
More information #ad
6. ROBTLE
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Professional Solar Heat Lifts Replacement Sensitive Vent Opener Cylinder Temperature Sensor Greenhouse Winder Opener Standard Opener Replacement for Greenhouse, Greenhouse Automatic Vent Opener
#adROBTLE #ad - Premium quality : made of quality material, durable, solid and convenient to use. To use with the greenhouse, you need to use the drilling tools to screw into the channel and fix it.Tips : do not use this opener anywhere the temperature will exceed 45° 122F. Solar energy : non-electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops.
More information #ad
This products need to be refrigerated before use it. Greenhouse helper : as the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating. Automatic vent opener replacement : Ideal for your greenhouse window.Brand | ROBTLE #ad |
Manufacturer | ROBTLE #ad |
Height | 0.79 Inches |
Length | 14.17 Inches |
Weight | 0.24 Pounds |
Width | 3.94 Inches |
Part Number | c51zf9b6vd |
More information #ad
7. Ycsst
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Ycsst Univent Automatic Vent Opener Standard Automatic Roof Vent Opener Solar Heat Sensitive Greenhouse Autovent Vent Opener Standard Two Springs Solar Automatic Ventilation Openers-Lifts 33 Lbs.
#adYcsst #ad - Easy to install:Uses Solar energy only, no power required. Excellent quality:stainless steel galvanized sheet, double spring design, automatic temperature adjustment 15-25°.Working conditionthe maximum height of the open window is about 45 cm 18 inches. Tips:note: do not apply excessive loads by locking or covering window. The automatic ventilation window opener in the greenhouse cannot be used in an environment with a temperature higher than 50°.
More information #ad
Suitable for most greenhouses:the automatic window opener is suitable for greenhouse planting. This product is only suitable for windows installed in greenhouses. The maximum load-bearing capacity of the glass of the ventilation window does not exceed 33lb.Brand | Ycsst #ad |
Manufacturer | Ycsst #ad |
Height | 1.57 Inches |
Length | 12.4 Inches |
Weight | 1.23 Pounds |
Width | 1.38 Inches |
More information #ad
8. Agriculture Solutions
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Agriculture Solutions Univent Automatic Vent Opener Standard, Lifts 15 Lbs
#adAgriculture Solutions #ad - Solar vent opener can lift up to 15 lbs. Screw directly into polycarbonate panels, wood, or metal frames. Starts opening between 55 - 75°F, depending on how you have adjusted the vent.More information #ad
Brand | Agriculture Solutions #ad |
Manufacturer | Agriculture Solutions LLC #ad |
Height | 1.97 Inches |
Length | 11.81 Inches |
Weight | 0.88 Pounds |
Width | 1.97 Inches |
Part Number | 441665 |
Model | 441665 |
More information #ad
9. Just E Joy
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Just E Joy Greenhouse Automatic Window Opener Kit Solar Sensitive Cylinder Replacement Temperature Sensor Vent Opener Greenhouse Supplies
#adJust E Joy #ad - With installation Accessory: Comes with a fitting accessory pack for easy installation. Durable and rust-proof Iron windows opener for last long time use.As the temperature changes automatically, maintains the best growing temperature and prevents your greenhouse from overheating. Great functionthis window openr can prevent greenhouse overheating well as you want.
More information #ad
Non-electric, uses solar energy, open or close the greenhouse vents as temperature rises or drops. High quality stainless steel materials for superior stability,and Automatic Greenhouse Window Opener can extended cylinder use lifetime.Brand | Just E Joy #ad |
Manufacturer | Just E Joy #ad |
Height | 3.15 Inches |
Length | 12.6 Inches |
Weight | 0.02 Pounds |
Width | 3.94 Inches |
Part Number | 15922138104125 |
More information #ad
10. Estink
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Greenhouse Window Openers, Automatic Roof Vent Opener Replacement with Solar Powered for Greenhouses
#adEstink #ad - So that our renowned hydraulic cylinders replaces the small range of window openers. Easy installation:the window could be clamped onto or screwed onto your greenhouse frame. Hydraulic cylinder with wax:our core technology is the hydraulic cylinder that contains a plant-based wax, works as the greenhouse window openers thermostat, thus there is no need for electrical power supply.Save your energy and time, instead of electric, and no need for human operation.
More information #ad
Solar energy:using the solar energy, open or close the greenhouse vents as temperature rises or drops. Do not apply excessive loads by locking or covering window. Please ensure your greenhouse window can be opened freely by at least 45cm 18". Co2 friendly:the window opener will be very environmental and CO2-friendly throughout its whole lifetime because there is no need of electricity in your greenhouse. Automatic design:the automatic window opener opens and closes your greenhouse window as the temperature changes automatically, maintaining the best growing temperature and prevents your greenhouse from overheating.
Brand | Estink #ad |
Manufacturer | Estink #ad |
Height | 0.63 Inches |
Length | 12.01 Inches |
Width | 0.63 Inches |
Part Number | Yosooy34zfd9pqc |
More information #ad