Bayliss MK7 Replacement Power Tube

These Bayliss vent openers came with our greenhouse "kit" about 30 years ago. They really perform flawlessly for 7-8 years before the seal in the cylinder gives out. Replacing only the power cylinder seemed a more economical option, so I tried that. Surprisingly little cussing involved, only a few tools needed. The instructions were very good and very comprehensive. I'm happy with both the replacements and the costs/shipping. A recommended option to purchasing the entire vent opener.

Outstanding customer service the wonderful lady called just to confirm our address and what we had ordered prior to shipping. I think that’s fantastic. Customer service also the MK seven’s working exactly like they should. Thank you very much. You’re my go to for greenhouse stuff.

Finally, I changed the Bayliss MK7 replacement tube. Replacing was surprisingly Easy and straightforward, Working Good, just in time for our 90 degree weather.

ACF Greenhouses was the only place I could find a replacement tube. I had some MK7 Bayliss auto openers but they were stored in the heat for a long time before installation and didn't seem to work properly. I read that it might be the tube. I ordered replacements and swapped them out, and now they work! Saved $ just replacing the tube compared to the whole thing.

We live in northwest Oregon and don't get high daytime temperatures this time of year. I wanted to keep the vents closed a little longer and target a daytime high temp inside the greenhouse around 85 degrees to counteract the nighttime temps in the mid 40s. This "orchid" opener does the trick. I rated it 4 stars because there is a single use disk that you must remove to swap out the openers. I would like to see a pin that could be removed as needed.

The Bayliss MK7 power tube works great. I ordered two for my greenhouse. They are very easy to install. If you ordered these then you must order the Replacement Spacer Set. Shipping was fast too!

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!

Works great and last a long time. Keeps the greenhouse cooler automatically. Been using them for years.

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.