Apeks XL4+ Regulators

The Apeks XL4+ regulator is a compact, lightweight regulator suitable for diving in all environments including cold water locations. Its design and low weight help reduce jaw fatigue on long dives. The XL4+ regulators also make an ideal stage regulator, perfect for the exploration diver with a large amount of equipment. It's also available as a stage 3 (first stage, 2nd stage and alternate air source) or stage 4 set (plus SPG).

Key Features of the Apeks XL4+ Regulator Set

• Ultra-Lightweight Design
• One of the lightest regulators in the Apeks range, making it ideal for travel diving and reducing jaw fatigue on longer dives.
• Cold Water Rated Performance
• Fully environmentally sealed first stage with advanced heat exchange technology, ensuring reliable performance in cold water environments.
• Compact & Streamlined Profile
• Designed to minimise drag and improve comfort, especially useful for technical diving, sidemount setups, and tight spaces.
• Over-Balanced Diaphragm First Stage
• Delivers consistent gas flow at depth by increasing intermediate pressure as you descend, ensuring smooth breathing in all conditions.
• Pneumatically Balanced Second Stage
  Provides effortless breathing performance regardless of depth or tank pressure.
• Diver Changeable Exhaust System (DCE)
• Supplied with two exhaust tees, allowing divers to customise bubble dispersion for improved visibility.
• Ergonomic Venturi Control Lever
  Easy-to-use control helps prevent freeflows at the surface and enhances performance underwater.
• Flexible Braided Hoses
• Lightweight, durable hoses improve comfort and packing convenience while reducing jaw fatigue.
• High Oxygen Compatibility
  Suitable for use with up to 40% oxygen straight out of the box, making it perfect for nitrox diving.
• Robust, Durable Construction
• Built to withstand demanding diving environments, including UK cold water, wreck diving, and technical applications.
• Perfect for Travel & Technical Divers
• Combines compact size, light weight, and rugged reliability—ideal for both travelling divers and those diving in challenging conditions.

If you need help choosing the right regulator for you then read our 'Ultimate Guide to Choosing the Right Regulator'.

Apeks XL4+ First Stage

• 2 high-pressure ports.
• Compact machined first stage based on the expedition tested Apeks DS4 platform.
• Break through, innovative over-moulded first-stage endcap and environmental diaphragm helps prevent ice build-up that can cause first stage free flow in extreme circumstances. Also protects the first stage from impact damage
• Large surface area heat exchanger diaphragm clamp helps increase the gas temperature inside the first stage, resulting in improved cold water performance.
• Unique over-balanced diaphragm design – as the diver descends, the over-balancing feature allows the medium pressure gas in the hose to increase at a faster rate than ambient. This results in superior performance at depth.

Apeks XL4+ Second Stage

• High performance pneumatically balanced lever operated poppet valve.
• Large, over moulded self-flushing and controllable purge button.
• Ergonomic Venturi lever is easy to use and locate.
• White flexible nylon braided hose has better cold water performance than traditional rubber hose.
• Standard metallic hose connection for interchangeability.
• Comfo-bite mouthpiece has a unique bridge that fits across the upper palate and does not require bite pressure to stay in place.
• Compatible with XL4 Octopus.
  

Technical Specifications