I have three cylinders from Thickwall, a 2, 2.25 and 2.5”. I’ve had the 2” the longest and it’s had the most use, but as I now pack it immediately I don’t use it anymore. I now use mostly the 2.25”. The only real issue I have with these cylinders is opacity? The 2” is the worst, being so cloudy it’s difficult to see what’s happening inside and the 2.25” is starting to go that way. As far as I’m aware I’ve not done anything that should cause this to happen, I’ve only ever used water soluble moisturisers for a lube and occasionally applied heat through a rice sock and, though more difficult to apply evenly, and IR lamp for reptile houses. Has anybody else had any similar experiences? BTW. My first pump from Thickwall came with a faulty valve that they replaced and I also bought a couple of spares.