I am using a PA-15-18-22 cylinder to operate a cat flap that weighs less than 5 lbs. I'm on cylinder two. The first cylinder was very reliable and good looking, but made a loud squeak. The second cylinder with the same part number is much quieter and works fine, but my limit switch failed and I had to tap the cylinder to get it working again. For this reason I only gave 3 stars. It is currently working fine. The time will show.
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