The Delta 5 is the next step in a long line of remarkably reliable, durable and smoothly breathing regulators to carry that name. Sure, we've given it an updated look, but that s not all. Like the deltas before it the 5 comes standard with our patented Dynamic Adjustment Technology that, once set by the diver, provides consistent airflow at any depth. It also comes standard with a dive/pre-dive switch and a super comfortable orthodontic mouth piece. This latest edition though has a new, and updated, all metal pneumatic valve providing super smooth breathing performance in any condition.