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Many common product-related questions can be answered through our Frequently Asked Questions knowledge base.

General Enquiries

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Main Office

Aqua Lung UK
Neptune Way, Blackburn, Lancashire, England
United Kingdom, BB1 2BT
Phone (Within the UK): (01254) 692200
Phone (USA, Canada, Caribbean): 011 44 1254 692200
Phone (International): 00 44 1254 692200

Reception Facsimile

Phone (Within the UK): (01254) 692211
Phone (USA, Canada, Caribbean): 011 44 1254 692211
Phone (International): 00 44 1254 692211

Q. What is a cold water regulator?

A. It is a regulator that is designed to be used in water of any temperature. The first stage is environmentally sealed.

Q. What is a warm water regulator?

A. A regulator designed to be used in water 10 degrees Celsius and above.

Q. What is the intermediate pressure of Apeks regulators?

A. All Apeks regulators have an intermediate pressure of 9.0 - 10.0 BAR

Q. How often should my Apeks regulator be serviced?

A. The second stage stage should be serviced annually. The first Stage should have the intermediate pressure checked and filter changed annually and be fully serviced every 2 years.

Q. Can my Apeks regulator be converted for Oxygen/Nitrox service?

A. Apeks regulators as standard are suitable for use with up to 40% O2 but you must check what regulations apply to your country. For example within Europe we must adhere to the European Standards EN144-3 and EN13949 which state that regulators used with EAN over 21% must use the special Nitrox M26 fitting. The following models can be converted for nitrox use with over 40% oxygen ( up to 100%); T40D, TX40, T50D, TX50, TX100, T20, ATX200, ATX100, ATX50, ATX40, AT20, XTX200, XTX100, XTX50, XTX40, XTX20, Egress, TEK3.
Late 5000ST and Sentinels. Older piston first stages cannot be converted.

Q. Which way up should the 1st stage be fitted to the cylinder?

A. It doesn't matter, it comes down to personal choice. It does not affect the function of the regulator.

Q. Do you have agents in other countries?

A. Apeks have local agents throughout the United Kingdom as well as International distributors worldwide.

Q. Can my yoke clamp regulator be converted to 300 Bar Din?

A. Yes, all it requires is a Din handwheel assembly (AP0211) to be fitted in place of the yoke clamp.

Q. What is a removable ARCAP seat?

A.The seat is the sealing face in the body of the first stage. The Removable ARCAP seat has advantages over a seat machined into the body of the first stage. Firstly it is removable so if the seat was damaged it would not be necessary to replace the whole body of the first stage which would be expensive. Also it can be made of a different material to the brass body. In the ATX200 the seat is made of ARCAP which is a higher 'corrosion resistant' material than brass. A removable seat can also be machined to even finer tolerances than a seat machined into the body of a first stage.

Q. Will the Apeks computers allow you to plan a two mix dive in advance? Is it possible to plan a dive time based on a bottom mix followed by a switch to say a 70% decompression mix at 12 metres?

A. Yes. This can be done via the computers' simulation software for the interface unit.

Q. Can Apeks regulators be left and right handed?

A. The XTX, MTX-R and Black Sapphire range of Apeks 2nd stage regulators are suitable for both left and right handed use. An authorised Apeks technician can easily change the hose routing. Contact your local dealer for details.

Q. What is TEK3?

A. TEK3 is an innovative 1st stage regulator system specifically designed for twinset diving. More information can be found in the PRODUCT SECTION under 1st STAGES

Q. What is the purpose of the venturi lever on the 2nd stage of the regulator?

A. Many Apeks 2nd stages are equipped with a diver controllable venturi system. This switch allows the diver to control the venturi assist to reduce the sensitivity to free-flow and provide the maximum airflow at depth. Whilst diving the switch should be set to the plus (+) position to achieve maximum assistance for easier breathing. To prevent the 2nd stage from free-flowing this should be set to the minus (-) setting during entry or while swimming at the surface.

First Stage Technology

Over-balanced Diaphragm Design

The heart of any regulator is the first stage. Most Apeks first stages utilise a unique over-balanced diaphragm design. In an over-balanced first stage design, the inter-stage pressure in the hose increases faster than traditional balanced models as a diver descends to greater depths. This increased inter-stage pressure compensates for the increased density of your breathing gas by allowing a larger volume of gas to flow through the system on demand. The result is superior breathing performance regardless of depth. The over-balanced diaphragm design is found on Apeks Tungsten, XTX200, XTX100, XTX50, XTX40 and XTX50/DS4 first stages.

Environmental Dry Sealing System

Standard on most Apeks first stages is the unique Environmental Dry Sealing System. This system serves a number of purposes, including the prevention of ice build up on the main spring that can occur when diving in extremely cold water. Dry sealing the first stage also acts as a safeguard against the entry of contaminants and silt into the main spring chamber, and eliminates the need for messy silicone oil or grease filling inside your regulator. The Environmental Dry Sealing system is found on Apeks Tungsten, XTX200, XTX100, XTX50, XTX40 and XTX50/DS4 first stages.

Second Stage Technology

Pneumatically Balanced 2nd Stages

In most other regulator brand’s second stage designs, the inhalation effort of the diver opens a valve inside the regulator that is held closed by spring tension.

Apeks second stages feature a pneumatically balanced valve system which means that the pressure on the second stage valve is "balanced" by allowing medium pressure air to pass through to the opposite side of the valve to help counteract the force of the spring. This reduces the inhalation effort required to open the second stage valve and substantially improves the overall ease of breathing in all diving conditions. This means that a dive on an Apeks regulator is a far superior breathing experience to that of other competing regulators.

Reversible Regulator

The Apeks XTX range of regulators can be dedicated to either left or right-handed use. While supplied in a right hand configuration, the hose routing can be altered from right to left or left to right by an Authorised Apeks Service Technician. This extremely useful feature offers greater flexibility for those who like to configure their kit in a particular way and sets Apeks regulators apart from other brands of regulators.

The Apeks Reversible Venturi System (RVS)

The Apeks Reversible Venturi System (RVS) allows the diver to control the venturi assist with greater precision due to indexable Venturi Lever. Gas flow to the diver can be directed towards the mouthpiece by indexing the venturi lever towards the plus position. This allows the diver an assisted breathe resulting in a more comfortable dive with less breathing effort.

With the venturi lever in the minus position, the air-flow in the second stage is directed onto the diaphragm, closing the valve and preventing freeflow.
The Indexable Venturi Lever can therefore act as a pre dive switch. When set in the minus position the second stage will not freeflow during the entry phase or if the regulator is dropped in the water. When the diver begins to use the regulator the venturi lever can be indexed toward the plus position and the second stage will give the diver an assisted breathe resulting in a more comfortable dive with less breathing effort.

Due to its unique design, the venturi lever can be moved to either the left or the right side of the regulator, depending on the desired hose configuration, this work must be carried out by an authorized Apeks service centre.

Diver Changeable Exhaust System.

The Diver Changeable Exhaust (DCE) offers user the choice of either a compact, light-weight exhaust tee on the second stage or a wider exhaust. By using the wider exhaust, bubble interference can be avoided, perfect for photographers who wish to virtually eliminate exhaled air interfering with capturing the perfect image. The exhaust diffusers can be easily and quickly changed by sliding and locking the preferred set into place. Divers can now configure their own regulator exhaust diffusers for individual dive conditions or requirements.

Customer Care Policy

Customer Care Policy

Apeks Marine Equipment will strive to continue to design, manufacture and distribute the finest diving and swimming equipment in the world and give the best possible service to our customers. We aim to set clear standards of service and to regularly review and improve performance. We operate in an ethical manner treating customers, employees and suppliers as we would like to be treated. 

Our customer care policy will include the following:

Customer Experience:

We aim to understand and measure your expectations in order to provide an enhanced customer experience.

Our aim is to:

  • Conduct regular surveys and welcome feedback whether good or bad.
  • We will take into account any suggestions to improve our service made by both our customers and our staff, and make any changes that will enhance the service provided.
  • We will record and review all dissatisfactions raised in order to improve what we do, wherever possible.
Responding to correspondence:

Apeks Marine Equipment will answer all correspondence including letters, faxes and emails in a fast and efficient manner.

Our aim is to:

  • Endeavour to respond to queries within a 24 hour period.
  • To use email auto response when appropriate, an alternative colleagues name will be noted and not their e-mail address to reduce the risk of spam. 

Apeks Marine Equipment will aim to answer all telephone calls within 4 rings.

Our aim is to:

  • Introduce ourselves and the department in a courteous manner.
  • To accurately take all detail of the call.
  • At all times we will offer practical, clear and timely advice which is specific to your needs and requirements.
  • To transfer calls only when necessary and ensure the transfer is available to take the call to minimise the passing of the customer.

Members of staff will see visitors punctually when an appointment has been made at the office or an external venue. If no appointment has been made, members of staff will see visitors as soon as reasonably possible. All staff will approach visitors in a courteous manner.

Our aim is to:

  • See people within 10 minutes of the appointment time.
  • Maximum length of time a person without an appointment time should have to wait before they are seen is 15 minutes.

Apeks Marine Equipment will endeavour to deliver goods in a timely fashion

Our aim is to:

  • Deliver all UK orders within 48hrs.
  • To deliver all overseas orders in the most cost effective way, to meet all required delivery dates.
  • To endeavour to deliver all orders right first time and in full.
Technical Service:

Apeks Marine Equipment will ensure full technical support and product knowledge is available to support our equipment.

Our aim is to:

  • Ensure all relevant technical detail is circulated prior to new products coming to market.
  • To offer a complete and satisfactory maintenance programme with regular updates.
  • To enrol all internal support staff in a continuous training programme with regards to existing products and new products which may come to market.
  • To ensure when turnaround times are quoted they are met and if delayed the customer is informed.
Environment/ Quality:

Apeks Marine Equipment will strive to continue to produce quality products in line with the environmental accreditation ISO14001, to help reduce our carbon footprint through continuous reviews of the company’s aspects and impacts on the environment, to help maintain the environment for you and future generations. We will continually work towards maintaining accreditation to ISO9001:2008 and uphold all lifetime warranties on any manufacturing defect on equipment registered to the first owner.

Our aim is to:

  • To continue to meet all aspects of ISO14001 and ISO9001:2008.
  • To continue to measure the carbon footprint of any new product design and reduce wherever possible elements which may be harmful to the environment.

Apeks Marine Equipment will investigate all customer complaints for the service it provides and promptly deal with any complaints received.

Our aim is to:

  • Have zero complaints.
  • To deal with any complaints within 5 working days.
  • To actively inform the customer of the progress should a complaint occur.
  • To ensure the customer receives a total action and resolution should a complaint occur, through the quality 8D or corrective/ preventative action process.
Customer Quotes:

I found that a visit to the company and a tour around the manufacturing facility was extremely useful and informative. Having been involved in the diving trade for over fifty years and visited many diving companies both in the UK and overseas, it confirmed my long belief that Apeks was a worldwide leader in our diving industry – Collins and Chambers.

First class friendly team – Canary Divers.

It was great to see such a positive feeling from all Apeks staff and the high level of pride you all have in your products and manufacturing – M&A Distributor.

All quotes have been taken from a customer satisfaction questionnaire, distributed June 2014. 

Return and Exchange Policy

Returning a product

If you purchased your product through an authorised Apeks dealer, please return it unused to your Apeks dealer, along with all of the original packaging and tags, intact and fit for resale. Apeks does not accept returns of Apeks products purchased from unauthorised retailers.

Unauthorised Dealer Warning

Unauthorised Dealer Warning

If you obtain Apeks products from an unauthorised dealer, your warranty will not be valid, and we cannot offer you the assurances of quality and satisfaction afforded by the Apeks Warranty Program. To verify whether or not a retailer is an authorised Apeks Dealer, please check our dealer locator which you will find at the top of this page.

Warranty Qualification

Product Warranties

(covers those products labelled Apeks)

When a consumer buys Apeks products from an Authorised Apeks dealer, they are buying from trained professionals who can instruct them on the proper and safe use of the equipment.

It is dangerous for untrained and uncertified persons to use the equipment covered by these warranties. Therefore, use of these products by an untrained person renders any and all warranties null and void. Use of scuba equipment by anyone who is not a certified diver, or receiving training through a recognised certification agency, shall render void all warranties, expressed or implied.

Warranty Programmes

Limited Warranty

Apeks warrants to the original purchaser for a period of time (specified below for each product) from the date of purchase, that the product will be free from defects in materials and workmanship, provided that it receives normal use, proper care and prescribed dealer service subject to the limitations listed below. The limited warranty is extended only to the original purchaser for purchases made from an Authorised Apeks Dealer and is not transferable. This warranty is limited to repair or replacement only at the discretion of Apeks. Warranty coverage does not extend to damages caused by improper use, improper maintenance, neglect, unauthorised repairs, modifications, accidents, fire, casualty or normal wear and aging. Cosmetic damage(s), such as scratches, nicks and fraying are not covered under warranty except when the product is new, out of the original packaging. This warranty does not extend to equipment used for commercial or military purposes.

Warranty by Product Category

(Covers Apeks products)


Limited Lifetime Warranty
This warranty will cover the original owner of the regulator against defects in parts or workmanship for the lifetime of the regulator if the regulator was purchased from an Authorized Apeks Dealer.

BCs, Donuts and Wings:

Limited Lifetime Warranty
Buoyancy Compensator Replacement on a Pro-Rated Basis:
Buoyancy Compensators, under the Limited Lifetime Warranty, that malfunction due to material or manufacturer defects, that have also had a significant amount of use will be replaced on a pro-rated basis. Pro-rating will be determined by a percentage factor based on the condition of the product and how long the product was used prior to the warranty claim. This can be useful to evaluate Limited Lifetime Warranty claims since the warranty period is for the "useful life of the product" and not a set length of time. The following guidelines should be used in determining what pro-rated percentage will be used.

Pro-Rated Values for products sold at retail   

Pro-Rated Values for products sold at retail Apeks Pays Customer Pays
Like new and less than 2 years old 100% 0%
Used and less than 5 years old 75% 25%
Very used and more than 5 years old 50% 50%
Worn out 0% 100%


Analog Gauges and Compasses:
1-Year Limited Warranty

1-Year Limited Warranty

1-Year Limited Warranty

1-year Limited Warranty

1-Year Limited Warranty

Making a Warranty Claim

Warranty Claims

(covers those products labelled Apeks)

If you are the original owner of an Apeks product that is determined to be defective in any way, please return it to your local Authorised Apeks dealer. Please provide your dealer with photocopies of your original sales receipt along with any service records you may have. If your local dealer determines that you have a valid warranty issue and they are unable to take care of it in their place of business, they will send it back to Apeks for evaluation or replacement.

Recall Notice

Novemer 2014 - Recall Notice - Apeks Black Ice