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IST Sports O300 Octo Regulator

A high-visibility alternate air source regulator featuring balanced performance, ergonomic comfort and reliable breathing in all conditions.
By Scuba Diving Partner | Published On April 1, 2026
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IST Sports O300 Octo alternate air source regulator with yellow hose

Bright and reliable alternate air source.

Courtesy of IST Sports

The IST Sports O300 Octo regulator is designed as a dependable alternate air source, featuring a fluorescent-yellow purge cover and matching 36-inch braided hose for easy identification in emergency situations.

This high-performance second stage includes a pneumatically balanced mechanism and an integrated heat sink, ensuring smooth and consistent breathing regardless of depth or water temperature. A Venturi control and adjustable breathing knob allow divers to fine-tune airflow to their preferences.

Lightweight construction and an ergonomic mouthpiece help reduce jaw fatigue, making the O300 Octo comfortable to use while maintaining reliable performance when it matters most.

Why We Love It

Comfortable, full-featured design makes it a reliable and easy-to-use alternate air source.

Pricing:

$260

Learn more at istdivingsystem.com