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Love it! At first I thought they were not working because it would get hot inside the greenhouse but then I realized not so hot to open the vents. These did open and not when they shouldn't such as in the winter with it cold outside. I like them.

These fit my needs perfectly and I really appreciated the extra instructions that came with. I will definately order from ACF again. Thanks for a great product and service!

The replacement cylinder for our greenhouse roof ventilator fits exactly. It was easy to replace using the enclosed directions, but most importantly, the product arrived very quickly.

The Power tube is an exact replacement and is great, but when I went to replace it, all the plastic bushings and washers fell apart in my hands from sun rot. It would be nice to have them included with the tubes or at least available at ACF. I tried to find something at the hardware store but no luck. I ended up purchasing them from Bayliss UK; it was expensive and time consuming.

ACF Greenhouses: Those items are included in the Bayliss MK7 Replacement Spacer Set that we sell individually.

I have used cheap vent openers, and there is no question that these are stronger and better constructed. The replacement cylinders are a little tricky to replace, but once you do the first one, it's pretty easy.