Apeks AT20 US4 & AT20 Occy Regulator Sets

Original price was: $860.00.Current price is: $790.00. inc. GST

Apeks AT20 US4 & AT20 Occy Regulator Sets. Straightforward warm-water regulator set with a balanced second stage.

Colour: Black / Yellow

Type

Clear

Apeks AT20 US4 & AT20 Occy Regulator Sets

The AT20 and US4 package keeps a warm-water regulator setup straightforward. A balanced second stage, Venturi control and Comfo-Bite mouthpiece provide the core features you need for recreational diving, with the matching octopus completing the listed set.

Features and benefits

Balanced diaphragm first stage. The US4 balances the first-stage mechanism to regulate the supply as cylinder pressure changes.
Balanced second stage. Pneumatic balancing reduces the force needed to open the demand valve, helping the second stage respond smoothly as you inhale.
Venturi control. The lever changes airflow assistance inside the second stage. Use the pre-dive setting for surface handling and the dive setting as directed in the manual.
Comfo-Bite mouthpiece. The silicone palate bridge supports the second stage with less need to clench your jaw, which can make longer dives more comfortable.
Warm-water configuration. The US4/AT20 system is intended for water above 10°C, making it a straightforward option for suitable warm-water diving.
Visible alternate air source. The yellow hose and cover make the octopus easier to distinguish from your primary regulator when locating and deploying it.

Setup and compatibility

Connection: DIN, Yoke. Choose the fitting that matches your cylinder valve and its pressure rating. Intended for warm-water use above 10°C.

Care, rinsing and storage

After each dive, connect the assembled regulator to a scuba cylinder and open the valve to pressurise the system. Keep it pressurised while fully submerging the first stage, second stages and connected hoses in fresh water. This allows thorough cleaning of the exposed components and hoses while helping prevent water entering the internal air passages, where it can cause corrosion and damage. Keep the cylinder secure throughout cleaning.

For routine cleaning, Dive Gear Australia recommends Cressi Neoclean Wetsuit Wash Neoprene Cleaner 500 mL or Revivex Wetsuit Shampoo 10 oz to help remove salt, chlorine and everyday residue. Dilute according to the cleaner’s label, then rinse thoroughly with fresh water.

Keep the regulator pressurised throughout washing and rinsing. Lift it out of the water and dry the first stage and cylinder connection before closing the cylinder valve, releasing the pressure and disconnecting. Fit the clean, dry dust cap, then allow the regulator to dry in the shade. Store it with the hoses loosely curved, without sharp bends or tension.

Before each dive, inspect the mouthpiece, hoses and connections for wear or damage. Have your regulator serviced by an authorised Apeks technician at the interval specified in its manual, or sooner if it leaks, is damaged or its breathing performance changes. Leave internal adjustments and repairs to a qualified technician.

Technical Specs

Apeks AT20 US4 & AT20 Occy Regulator Sets technical specifications
Brand	Apeks Dive Gear
Main model / configuration	Apeks AT20 US4 & AT20 Occy Regulator Sets
Product type	Regulator
Regulator type	Regulator Set
Regulator connection	Din, Yoke
Second-stage design	Pneumatically balanced
High-pressure ports	1
Low / medium-pressure ports	4
Cold-water suitability	Warm water above 10°C
Mouthpiece	Comfo-Bite
Venturi control	Yes

Type	Din, Yoke

In-stock orders placed before 12 noon Melbourne time on weekdays are usually dispatched the same day once payment is confirmed. This excludes public holidays, pre-orders, backorders, special orders and custom orders. Dispatch times can vary. Delivery time depends on the carrier and your location.

Standard mainland Australian shipping is $20. Click & Collect from our Hallam store is free once your order is ready.

Large or bulky gear: additional freight charges apply on top of standard shipping: large dive bags $30; long freediving fins $15; long spearguns $20. Scuba tank freight is shown at checkout.
Rural, remote & offshore: rural means anywhere outside metropolitan areas. Carrier availability and additional charges may apply, including for island and territory destinations. Our team will contact you if an extra freight quote is needed.

The available delivery rate for your order is shown at checkout.

Need your gear urgently? You are welcome to arrange your own same-day courier or Uber pickup from Hallam. Call 03 9702 3694 before booking so we can confirm payment, that your order is packed and ready, and a collection time. Tell us who will collect and give your driver the order number. You arrange and pay the courier directly; delivery timing depends on the provider.

Read our full shipping and delivery information →

Contact us within 30 days of delivery to request a refund, exchange or optional store credit on eligible unused goods within Australia. Refunds go to the original payment method. Keep goods clean and undamaged with tags, original packaging and all accessories. No restocking fee applies to eligible returns meeting these conditions.

For change-of-mind returns and size exchanges, you pay return postage and replacement shipping. Original delivery charges are not refunded. Water-tested goods, clearly marked clearance items and genuinely custom-made or personalised items are excluded from change-of-mind returns. Ordinary discounted goods remain eligible.

For product problems, please call 03 9702 3694 before returning an item so we can help and explain the next steps.

Still unsure which size to choose?

Call our experienced dive instructors on 03 9702 3694 before ordering. Have your measurements and preferred product ready so we can help you choose the most suitable size. Fit varies between brands and models.

Read our full returns and exchanges policy →

FREE CLICK & COLLECT
Usually ready same day*

Select local pickup at checkout. We will email you when your order is ready. Please wait for your ready-to-collect confirmation before visiting, then bring your confirmation email and photo ID.

Need your gear urgently? You can arrange your own same-day courier or Uber pickup. Call 03 9702 3694 before booking so we can confirm payment, that your order is packed and ready, and a collection time. Tell us who will collect and give your driver the order number. You arrange and pay the courier directly; delivery timing depends on the provider.

Collect from our Hallam store
Factory 4 / 56–60 Hallam South Rd
Hallam VIC 3803

*For items in stock at our Hallam store during opening hours, subject to order processing. Available-to-order and special-order items take longer. Collection is unavailable while the store is closed.

View collection details and opening hours →

Can I collect my order from the store?

Yes. Choose free local pickup at checkout and wait for your ready-to-collect email before visiting our Hallam store. Bring your confirmation and photo ID. See Click & Collect details.

How do I choose the right size?

Use the product's size chart where available and compare your measurements with the guide for that brand. Sizing varies between brands and products. Still unsure? Call our experienced dive instructors on 03 9702 3694 during business hours before ordering. Have your measurements and preferred product ready. For fins and boots, tell us which socks or dive boots you will wear.

How do I check availability?

Select your required options, such as colour and size, to see availability for that variation. “Available to order” means the item may need to be sourced before dispatch. Call 03 9702 3694 to check the current lead time before ordering, especially if you need your gear for a trip or a particular date.

When will my order be dispatched?

Can I exchange an item if it does not fit?

Contact us within 30 days of delivery to request a refund to the original payment method, exchange or optional store credit on eligible unused goods. You pay change-of-mind return postage and replacement shipping; original delivery charges are not refunded. No restocking fee applies to eligible returns. Clearance and genuinely custom-made items are excluded from change-of-mind returns. Read the return conditions and next steps.

Can you help me choose the right gear?

Yes. Call 03 9702 3694 during store hours or email [email protected]. Tell us which product you are considering and how you plan to use it.

View all shopping FAQs →