Standard Hydraulic Cylinder Replacement for Univent, Thermovent, Optivent, Ventomax, & Sesam Liberty Window Opener

  • List Price: $11.39
  • Sale Price: $11.39
  • Availability: Usually ships in 2-3 business days


  • 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

Product Description

Replace your old (Univent, etc., Trademark) Piston Rod with genuine parts from Denmark, since 1981! Fresh from the factory, our turnover on this product is literally weeks from the manufacturer, giving you fresh wax and a dependable vent opener ready to replace your old or worn out cylinder/piston rod in these openers: OPTIVENT, UNIVENT, THERMOVENT, VENTOMAX, OR SESAM LIBERTY From the J. Orbesen Teknik Aps company out of Denmark: GREENHOUSE WINDOW OPENER replaces the J. Orbsen Teknik Openerw ONLY. REPLACEMENT CYLINDERS/PISTONS NO. 1 (W/O Thermometer). Due to many years of cooperation with greenhouse manufacturers, the installation of the cylinder is made very easy, and it fits most of our openers on the market. Apart from being used in our greenhouse window openers, the hydraulic cylinders are used in a wide variety of applications e.g. roof hatches; helicopters; power plants etc. Force push: 80 kg. Force pull: N/A. Stroke: 65 mm. Temperature, retracted: 17 ºC (62 F). Temperature, extended: 33 ºC (91 F). Color: Black INSTRUCTIONS: 1.) Place new cylinder in cool water or the refrigerator for 30 minutes. 2.) Remove old cylinder by undoing the hairpin clip and unscrewing cylinder and then check to see if your window or vent is moving freely. 3.) Reinsert new cylinder and replace hairpin in hole closest to cylinder for wider, earlier opening, or place hairpin in hole farthest away from cylinder for narrower, later opening. 4.) Adjustments: Always adjust the cylinder during a constant temperature, like middle day or middle night, so the cylinder can adjust slowly to its new settings. If you want the cylinder to open earlier/higher setting TURN CLOCKWISE. If you want the cylinder to open later/lower setting TURN COUNTER CLOCKWISE. One complete twist of the cylinder is about 1 degree, but results may vary from greenhouse to greenhouse.

Product Detail

  • Product Dimensions: 7.87 x 0.59 x 0.59 inches;
  • Item model number: No. 1
  • Average Customer Review: Customer Reviews

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