Features:

  • Replaces worn out Piston Rod from your J. Orbesen Teknik Brand Univent Window Openers
  • The core technology is the hydraulic cylinder that contains a plant-based wax
  • This special designed cylinder containing this wax, works as the greenhouse window openers thermostat, thus there is no need for electrical power supply
  • You don't need any electricity in your greenhouse; the window opener will be very environmental and CO2-friendly throughout its whole lifetime
  • Our renowned hydraulic cylinders replace our small range of window openers: Optivent, Univent, Thermovent, Sesam Liberty Vent, and Ventomax
Clear easy directions are here on Amazon

I need to replace these every couple years on my greenhouse vents. Clear easy directions are here on Amazon.

Univent replacement cylinder

this replacement cylinder actually works according the specifications. It arrived very quickly.

It opens and closes as expected

Works exactly as described. Opens the vent when it gets hot, closes when it gets cold.

Replaced standard issue

I bought this to replace the standard issue item that the manufacturer of my greenhouse had used. It works great. I've found that they last 7-9 years.

It has been in place for more than a month and it works fine.

I'm using this to open and close a greenhouse window (to regulate heat). This is a replacement piston for my existing "Univent" opener. It has been in place for more than a month and it works fine.

Perfect universal replacement

Although it was not the same manufacture of the original. It was a perfect fit as well as great construction.

Whet in exactly as the original and works great.

Replaced the old one from our greenhouse. This appears to be a genuine replacement part as it had all of the same markings and numbers stamped on it as the original. Whet in exactly as the original and works great.

Recommend

Product easy to install and functions well as described.

Works perfectly to vent my greenhouse with no electric.

Works perfectly on my greenhouse roof. Was just like the original that I had with my greenhouse.

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