When Buying A Regulator

TIP # 1: Make sure your dive shop is an authorized dealer for servicing and repairing your regulator’s brand choice.

TIP #2: Check if in your dive area they use in the tank a yoke valve with an o-ring; which is by far the most common style in use; or DIN valve that is typically used with high-pressure steel tanks. You also can have an adapter.
 
Yoke valve DIN valve with an adapter
TIP #3: A Nitrox-compatible regulator requires a Nitrox-compatible octopus or alternate.

TIP # 4: Your regulator’s mouthpieces needs to feel comfortable in your mouth. If your mouth and jaws are sore after a dive, the mouthpiece might not be a good fit for you.

TIP # 5: In the console of the regulator you can have a pressure gage (BARs or PSIs), Deep gage (Meters or Feet) or replace both by a diving computer. You also can add a compass to the console.

Tip # 6: Buy your regulator as a package or complete with all 4 hoses (primary second stage, alternate second stage, flow pressure hose and high pressure hose with console).