Question

A regulator system may include?

1) A first stage and primary second stage.
2) An alternate air source second stage (or a connection to an alternate-air-source inflator on the BC).
3) A submersible pressure gauge (SPG), which is usually part of an instrument console.
4) All of the above.

Answer 1

A regulator system in scuba diving typically includes a first stage, second stage, alternate air source, and a submersible pressure gauge.

Step-by-step explanation:

A regulator system in scuba diving typically includes:

1. A first stage, which reduces the high-pressure air in the scuba tank to an intermediate pressure and provides it to the second stage.
2. A second stage, which delivers air to the diver's mouthpiece on demand when the diver inhales.
3. An alternate air source second stage or a connection to an alternate-air-source inflator on the buoyancy compensator (BC), which allows the diver to share air with a buddy in an emergency.
4. A submersible pressure gauge (SPG), which is usually part of an instrument console and provides the diver with information about the remaining air pressure in the tank.

Therefore, the correct answer is option 4) All of the above.