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.

Product is the same as the one I am replacing. Perfect fit.

Bought an extra pair when we set up greenhouse because thought we might have problem getting replaceable. Just now installed spare set. Had no problem finding another spare set. ACF had best price and AMAZING delivery from VA to GA. British gardeners don't tolerate poor quality when they buy supplies as this high quality product shows.

When my 20 year old greenhouse vents stopped opening I thought I was in for a works of hurt and expense to fix them, not only did they have the exact parts I needed, they were inexpensive, shipped quickly and I was back up and running in a half an hour. Thanks!

Instructions were spot on as well!

The product opened the vents wide and i have no problem... Same variety as the house came with.