A dive regulator is the breathing device. Composed of two “stages,” the first stage of the regulator connects to the tank and the second stage, at the other end of a hose, delivers air to the diver’s mouth. It is called a regulator because it regulates the high pressure air from the tank down to a breathable flow. The first stage of dive regulators also has ports to connect a backup second stage, a tank pressure/depth gauge or a dive computer, and the inflation mechanism for the BCD. The setup is often called an Octopus.
The links for the scuba regulators below will take you to the corresponding page at California Diving News’ sister publication Dive Training Magazine. There you will find a full description of the product.
Seac DX 200
Scubapro MK25/S600 Deep Blue Titanium Core
Mares Fusion 52X