The alternate air source simplifies sharing air with another scuba diver, should the need arise. The alternate air source usually has a longer hose and a bright color so you can find it easily. You'll pick up more detail on alternate air sources in Section Two of this manual, and you'll get practice using one during your first confined water Bali scuba dive.

Besides these, your regulator will have a hose with a coupling device at the free end. This hose connects to the low-pressure inflator on your BCD. If you're using a dry suit, you'll have two of these; the longer one generally goes to your dry suit.Although there are several manufac-turers of popular regulators, virtually all regula-tors are made from the same basic materials. 

The first stage is generally made from chrome-plated brass, though there are a few high end models made from titanium. The second stage may be made from brass, high-impact plastics or a combination of both. Parts like mouthpieces and exhaust tees are generally made from plastic neoprene and silicone rubber.

As mentioned, you want to choose a regulator based on ease of breathing. With your PADI Bali scuba Dive Center's help,you can choose an easy-breathing regulator by comparing flow rates and breathing resistance. Virtually all modern regulators perform well within recreational Bali scuba diving limits, so you'll be choosing based on the feel you prefer, taking into consideration things like service availability and so on. Of course, you can usually purchase a suitable regulator that matches the style of your mask, fins, snorkel, BCD and tank