This atomizer is fantastic. It is easy to build on and very clean looking. The topcap fits tight on deck and it does not leak from the seams. In fact I have never had a leak out of it, but I am sure it would leak from the air holes given the angle and a large amount of juice. The brass ring moves easily around the top cap and is locked in place by the lid wish screws on. This lid is the reason I am giving this 4 instead of 5 stars. The threads are very fine and kind of sloppy. It just doesn't feel smooth and I feel like I am cross threading it every time I put it on. I would recommend others try this... but pay attention when you put the lid on it.