A ANLEOLIFE Replacement Cylinder for Automatic Vent Opener Temperature Controlled Window Snap Grow Greenhouse Acessories (Hydraulic Cylinder)

This is an update to my review of May 23, 2021:Last December, as I was completing work on a new greenhouse, I ordered three Anleolife Automatic Roof Vent Opener Snap Grow Greenhouse Acessories Solar Window Louvre Thread Openers. These are designed to open greenhouse windows when it becomes too warm inside. Since I live in Maine, it did not become too warm until today, May 23rd, five months after I purchased the openers, and well beyond the return date. In other words, within the return period, I had absolutely no way of knowing whether the openers would work properly.Two of the openers functioned fine. The third did not work at all (see photograph). Not a good ratio. And I am unable to contact Anleolife through Amazon to ask for help with this problem. Count me a dissatisfied customer.ADDITION TO 5/23 REVIEW:On June 11, after I submitted the the above review, Anleolife contacted me to say that I was sending a replacement for the defective opener. The replacement arrived a week or so later and works properly. Therefore, I have raised my rating from one star to three.

This restored my old dead ones to working order. The threads on this are aluminum and they will corrode over time. I had to use a vice grips to crush one of the old ones enough to remove it. Some grease or anti-seize on the threads will protect them from moisture and make replacement easier. In my experience these survive about 5 years of use.

I bought 4 of these solar powered automatic vent openers for my greenhouses. I paid extra for the fastest delivery, so I could have them installed and operating prior to a trip out of town. I installed them as soon as they arrived only to find that 3 out of the 4 hydraulic cylinders are defective. All the hydraulic fluid had leaked out of one of them prior to arrival and the other two looked fine but just didn't function at all. I could return them and get a refund but then I would have to take down all the vent openers that I installed so I'm forced to just buy 3 replacement hydraulic cylinders. Hope they work! The odds are not in my favor. If I were you, I would not buy this brand. Buy another brand!

Works as it should. Watch a few videos of like products to make your life easier on the install. Instructions are not user friendly, especially if this is your first go at installing one. Oil the expanding spindle before install (with vegetable oil). Make sure you add oil throughout the season to keep it lubricated. Many manufacturers recommend removing cylinder during the winter months.

I am using 2 on my greenhouse to open the end walk in doors for ventilation. One has been damaged during a high wind event. The aluminum frame failed but I didn't have a safety chain to keep the door from over extending then slamming back. Probably my fault. The other is fine and most importantly it's keeping the greenhouse temperature as controlled as designed.