I received 2 of these screw
tanks and tried them for a couple of weeks. I like them but there is a design flaw. The tube can easily leak, as the metal collars with the screw threads are knurled.where it is supposed to seal against the tube. Leakage happened immediately one one of them and I imagine it wouldn't take much use and/or cleaning for it to happen regardless. When you think about it, it doesn't make
sense to have a knurled surface on any part essential for an air tight seal (IMO I guess).