Regulators are devices that reduce the high-pressure air from the scuba tank to a breathable pressure. They consist of a first stage, which attaches to the tank, and a second stage, which delivers air to the diver’s mouth. High-quality regulators are designed for ease of breathing, reliability, and durability. They often feature adjustable breathing resistance, which helps divers manage air flow under different conditions. Maintenance is vital for regulators to ensure they perform correctly, as any malfunction could jeopardize the diver's safety.