Apeks XL4

Apeks XL4

599.99 649.99

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 also 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.

Add to Cart

Shipping Information

- Inventory is updated every 24 hours
- Products ship on Tuesdays and Thursdays
- Products/Sizes/Colour options not in stock can be requested using the Product Request Form here:


1st 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.

2nd 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.


Connections: Yoke and DIN available

Type of first stage: Over-balanced diaphragm design, environmentally sealed

Body Type: One piece forged body

Number of HP ports: 1 (7/16" UNF)

Number of MP ports: 4 (3/8" UNF)

Environmental Dry Kit: Standard

First stage exterior: Satin

Orientation: Convertible LH or RH

Coldwater Use: Yes

Type of second stage: Pneumatically balanced

Opening Effort Control Knob: Yes

Integrated Venturi Lever: Yes

Mouthpiece: Comfo-bite™

Exhaust tee: Standard, one set

Heat Exchanger for freezing resistance: Yes

Hose typeBraided Flexi-hose

Overall work of breathing (WOB) scoresAvg. 0.90 joules/liter

Nitrox compatibleYes to 40% O2 when new, out of the box / Can be O2 cleaned to 100%.