The Rotokeg has a 4" neck to aid cleaning. It has a combined pressure release valve and an S-30 injection valve built into the lid. Extra gas can be introduced by using the Super 30 Gas cylinder. There is an internal float system that draws beer from the top and serves from the top tap. The keg comes complete with two sturdy carrying handles and to finish the true dispensing experience, there is also a detachable drip tray. The build quality of these kegs really is superior compared to other 4" kegs.