The Apeks DS4 Nitrox 1st Stage M26 is your reliable gateway to enriched air diving. Designed for use with Nitrox mixtures containing up to 100% oxygen, this robust first stage regulator ensures safe and consistent performance. Its compact and streamlined design makes it ideal for both single cylinder and stage cylinder configurations. The DS4's dependable functionality provides the peace of mind you need to explore the underwater world with confidence, knowing your equipment is up to the task.