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XL4 Black with

XL4 Octopus

Brand: Apeks

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*Once you’ve placed an order, you will receive an Order Acknowledgement email to confirm your order details. After confirmation, your order is reserved for you for 72 hours for pick up at our store.




The Apeks XL4 is especially well-suited for the technical exploration diver who prefers cold water climates. Compact and lightweight, it helps reduce jaw fatigue during long, cold dives. Designed with an innovative, over-moulded endcap in conjunction with the environmental diaphragm that helps prevent ice build-up. The XL4 makes an ideal stage regulator and is also an excellent high-performance option for the technical exploration diver who is serious about maximizing functionality and minimizing weight.

Features & Benefits

First Stage:

  • Breakthrough, innovative over-moulded first-stage endcap and environmental diaphragm help 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 1st 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

  • Compact machined 1st stage based on the expedition tested Apeks DS4 platform.​

Second Stage

  • Compact and lightweight 2nd stage improves comfort and helps reduce jaw fatigue on long duration dives

  • 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

  • Flexible nylon braided hose has better cold water performance than traditional rubber hose

  • Standard metallic hose connection for interchangeability

  • Comfo-biteTM mouthpiece has a unique bridge that fits across the upper palate and does not require bite pressure to stay in place

  • Re-useable mouthpiece clip makes it simple to change mouthpieces in the field

  • Durable and flexible rubber exhaust tee provides excellent bubble diversion.

XL4 Octopus

Features & Benefits


  • This octopus is based on the XL4 second stage

  • Designed for coldwater with the performance you expect from an Apeks pneumatically balanced valve

  • Diver adjustable venturi control

  • Durable and flexible rubber exhaust tee

  • The unit has a high visibility yellow accent pieces and a 36” braided yellow hose

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