
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.
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-bite™ 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 |
Coldwater Use |
Yes |
Type of second stage |
Pneumatically balanced |
Opening Effort Control Knob |
No |
Integrated Venturi Lever |
Yes |
Mouthpiece |
Comfo-bite™ |
Exhaust tee |
Standard, one set |
Heat Exchanger for freezing resistance |
Yes |
Hose type |
Braided Flexi-hose |
Overall work of breathing (WOB) scores |
Avg. 0.90 joules/liter |
Nitrox compatible |
Yes to 40% O2 when new, out of the box / Can be O2 cleaned to 100%. |
Free Parts for Life Program (Regulator Service Agreement)
The Free Parts for Life Program allows the customer to receive free parts when the regulator is due for overhaul. Free parts consist of the normal replacement items as found in the Regulator 1st & 2nd Stage Service Kits. Labor charges are not covered. Assuming the program guidelines are followed, the Free Parts for Life Program will apply to the life of the regulator and will significantly reduce the cost of ownership. This program is in addition to the standard product warranties outlined in the owner’s manual.
The Free Parts for Life Program is a commitment by you (the Regulator owner), your Aqua Lung Dealer and Aqua Lung. To participate, you must be the original owner and have purchased the regulator from an Authorized Aqua Lung or Apeks America Dealer. Rainbow Reef Dive Center is an authorized Aqualung Dealer. We can service and repair Aqua Lung and Apeks equipment. The regulator must be brought to an Authorized Dealer at least once a year for inspection or overhaul according to the below schedule:
Register Your Aqualung Regulator Here
- Year #1: Inspection
- Year #2: Overhaul
- Year #3: Inspection
- Year #4: Overhaul
- Year #5: Etc.
To keep the Free Parts for Life Program active, both inspections and overhauls need to be documented in the Annual Service & Inspection Records included in the Owner’s Manual CD or can be found online here. If an inspection or overhaul is missed, the regulator no longer qualifies for the Free Parts for Life program.
Warranty Information
USA only All warranty transactions must be accompanied by proof of original purchase from an Authorized Aqua Lung Dealer. Be sure to save your sales receipt, and present it whenever returning your regulator for warranty service.
The Aqua Lung Satisfaction Guarantee™ If any Aqua Lung product that you have purchased from an Authorized Aqua Lung Dealer fails to meet your expectations, Aqua Lung America, Inc. will replace or exchange the product free of charge within thirty (30) days of the original purchase. Exchanges will be made through the same Authorized Dealer for Aqua Lung America, Inc., for merchandise of equal or lesser value, and will be made only for Aqua Lung equipment. Aqua Lung America, Inc. makes this guarantee of satisfaction a part of all product warranties because of the confidence we have in our products.
The Aqua Lung Limited Lifetime Warranty Aqua Lung America, Inc. warrants to the original purchaser that the product will remain free from defects in material and workmanship throughout its useful life; provided that it receives normal use, proper care and prescribed dealer service subject to those restrictions stated below. This limited warranty is extended only to the original purchaser for purchases made from an Authorized Aqua Lung Dealer, and is not transferable. This warranty is limited to repair or replacement only at the discretion of Aqua Lung America, Inc.
WARNING : It may be dangerous for untrained and uncertified persons to use the equipment covered by this warranty. Use of SCUBA equipment by anyone who is not a trained or certified diver, or is not currently receiving training through a recognized certification agency, may lead to serious injury or death.
This warranty gives you specific legal rights. You may have rights that vary from state to state and country to country. AQUA LUNG AMERICA, INC. DISCLAIMS AND EXCLUDES ANY LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES Some states in the U.S. and certain foreign countries do not allow exclusions or limitations of liability for incidental or consequential damages, so this may not apply to you.
IMPORTANT: Please note that for any and all warranty benefits, you must keep your original purchase receipt showing the name of the U.S. Authorized Aqua Lung Retailer, name of original owner, purchase date, product model name, part #, purchase price, and relevant serial #
Online Warranty Registration Bonus Aqua Lung offers several Online Warranty Registration Bonus e-coupons for selected products purchased through an Authorized Aqua Lung Dealer in the U.S.A. In order to receive the Online Warranty Registration Bonus, the product warranty must be registered online within 30 days after purchase. Restrictions The following restrictions apply to this warranty:
1. This warranty does not cover normal wear. Factory prescribed service by an Authorized Aqua Lung Dealer is required at least once annually.
2. This warranty does not extend to damages caused by improper use, improper maintenance, neglect, unauthorized repairs, modifications, accidents, fire, or casualty.
3. Cosmetic damage, such as scratches, dents, and nicks are not covered by this warranty.
4. This warranty does not extend to equipment used for rental, commercial, or military purposes.
5. This warranty covers products purchased in the United States. For warranties that may apply elsewhere, please contact your local representative.
6. Failure to meet any of the above requirements will render the warranty null and void.