Review on Thermaltake Pacific Chrome 4 C-ProG1/4 PETG 16mm OD Compression Fitting with Build-In O-Rings (CL-W213-CU00SL-A) by Jay Swearengin

They fit snugly and securely onto my 16mm Thermaltake hard tubes and I definitely couldn't get perfect bends. Leaks don't even bother me after use. RGB looks fantastic and the software is pretty light, but it can't be closed while in use, or random RGB is selected for the lighting by default. The fixtures themselves, while great, are quite large, so be aware if you're short on space. Finally, they can be a cable management nightmare. Apart from the big controls, the non-closing software (hardware doesn't save settings) and the many cables, everything is great. (price may be slightly higher)