There is a valve and a spring on the air inlet with a lever that operates the valve when you push on the purge button. When you breathe in the diaphragm pushes on the lever and opens the valve. Some people say you can replace the spring with a softer spring or cut the spring down but the easiest thing to do is remove the valve completely. It then becomes a free flow air delivery. I did this with this cheap Chinese octopus regulator. It is perfectly safe if you follow the three rules mentioned. It also pays to attach the hookah air line to a belt or harness with the regulator hose going over your shoulder so the hose doesn't pull on the regulator.
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