Price: $19.95
AVAILABILITY:
Availability: In Stock - Usually ships in 1 to 2 days.

This cylinder tube powers the Univent and Ventomax automatic openers with no need for electricity. It contains a mineral wax which expands with heat. This pushes a piston which opens the auto vent via a balanced linkage. As the temperature drops, the wax shrinks and a strong spring closes the vent and resets the piston. Made in Denmark.

While this automatic vent opener cylinder lasts a long time, eventually the piston rod moving through the seals will wear the seal material away, allowing a gradual seepage of wax out of the tube. This in turn reduces the pressure within the tube and eventually the opening distance achieved will be affected. This is when you need to replace the power tube cylinder.

Overall Customer Rating of 6 Reviews:
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CA

Tecnik cylinder

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I spent a lot of time looking for a replacement piston for my greenhouse vent opener; most are too long for my opener and extend several inches when closed. Apparently mine is a Teknic and needs to have the piston with almost no extension when closed, and this one was perfect. Customer service was very responsive in giving me dimensions which allowed me to confidently make the purchase. Thank you

Univent replacement power tube

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I purchased the Univent replacement power tube. I received it fairly quickly and it works great.

Perfect

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Item was a perfect fit; works exactly as it should.

Arkansas

Univent Ventomax Replacement Power Tube

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Units arrived in great shape and very quickly. They fit our units and work perfectly! Would recommend ACF Greenhouses - nice people and they know their products. Will certainly use them again!
Dave

IA

Defective Power Tube after 3 weeks

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Purchased a Univent / Ventomax Replacement Power Tube on March 8. On March 29 the tube burst and is unusable.
ACF Greenhouses: I'm sorry your power tube stopped working. We will have a replacement shipped out to you right away!