REGULATORS

Regulator Components:
First stage – Attaches to the scuba tank valve, reduces tank air pressure to an intermediate pressure and routes it to several hoses.
Second stage – Mouthpiece you breathe from. Also called a demand valve because it gives you air when you demand it (inhale) at the exact pressure you need for breathing comfortably.
Alternate air source – Spare mouthpiece that provides an easy way to share air in case you need to help another diver. Sometimes the alternate second stage is built into the inflator on your buoyancy control device (BCD).
Low-pressure BCD inflator – Connected to the first stage by a low-pressure hose. If you wear a dry suit, you’ll have another inflator hose connected to it.
Console – Connected to a high pressure port on your first stage with three gauge: the Submersible Pressure Gauge (SPG) that tells you how much gas pressure i sin your tank, a depth gauge to tell you how deep you are and your deepest point of the dive, and a compass for navigation.