Mark T on 07/08/2019
I have tried several different brands of tubes. Most have disappointed. These tubes have a 25mm filter. (1 inch)
The quality control of the 1839 tubes is second to none. Each tube is identical to the last one and the next one. I get no failures while filling them. They are not available where I live so I order them and have them shipped. I will not use any other product(s) if given the chance.