What is the difference between the two cylinder systems?

The new Quick Connect pink handle system, like in our ART, DUO and TERRA Sparkling Water Maker, is part of the next generation of cylinders. It offers a new and effortless way to insert and remove your gas cylinder without the need to screw it into the Sparkling Water Maker. You no longer need to check if the cylinder has been tightened enough or too much.