Cressi AC5 + Zen + Octopus Zen Regulator
From: Original price was: $968.00.$874.90Current price is: $874.90. inc. GST
A straightforward warm-water regulator with an unbalanced piston first stage and compact Zen second stage. A large purge, radial pressure openings and Venturi lever keep everyday handling simple. Paired with the Zen octopus; select your connection and any optional extras.
- Description
- Technical Specs
- Additional information
- Product Manual
- Shipping
- Returns & Exchanges
- Click & Collect
- Frequently Asked Questions
- Reviews (0)
Cressi AC5 + Zen + Octopus Zen Regulator
The Cressi AC5 Zen is a straightforward regulator for recreational diving in warm water. It pairs an uncomplicated piston first stage with the compact Zen second stage, giving you an accessible purge button and a simple dive/pre-dive lever without an extra breathing-effort knob.
Features and benefits
- Unbalanced piston first stage. The AC5 uses a simple piston mechanism, with an external intermediate-pressure adjustment for authorised service technicians. Routine user care remains rinsing, inspection and professional servicing.
- Easy-to-rinse openings. Large openings around the first stage help fresh water reach the exposed areas during post-dive rinsing, so salt and debris are easier to wash away.
- Radial pressure openings. Openings around the front cover distribute water pressure across the diaphragm. This helps reduce unwanted valve activation from moving water, alongside the Venturi pre-dive setting.
- Dive/pre-dive control. The Venturi lever changes how the air stream assists inhalation. Use the pre-dive position during surface handling and while an alternate second stage is stowed, then the dive position when breathing from it, following the manual.
- Small second stage. The compact body reduces bulk at your mouth and is easy to pack. A large front purge button remains easy to find by touch.
- One high-pressure outlet. The first stage has one HP port and four LP ports. Plan the arrangement of a pressure gauge or transmitter with your technician if your setup needs more than one HP device.
Setup and compatibility
Choose the DIN or yoke option to match your cylinder valve and pressure rating. Have the complete regulator assembly configured and checked by a qualified technician. The maximum usable pressure is limited by the lowest-rated component in the system.
This combination is for water above 10°C. A cold-water second stage alone does not turn a warm-water first stage into a cold-water regulator system.
What is included in the base set?
- 1 × Cressi AC5 Zen Regulator
- 1 × Cressi Zen Octopus
The list shows the required components at the default quantities. Your selected connection, quantities and optional extras determine the final package.
What else will I need?
A pressure gauge is not included in the base package. Check that you have a compatible pressure gauge and the required high-pressure hose, or select an appropriate optional gauge where offered.
A regulator bag is not included in the base package; choose suitable protection for storage or travel if you need it. Check whether your BCD or drysuit supplies its inflation hose, and compare any additional hoses needed for your equipment. Confirm the cylinder connection and have the complete fittings and hose routing checked by a qualified technician.
Which extras are optional?
These items are extra selections and are not automatically included in the base package:
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 Cressi 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
| Brand | Cressi |
|---|---|
| Main model / configuration | Cressi AC5 / Zen |
| Product type | Regulator |
| Regulator type | Regulator Set |
| Regulator connection | Din, Yoke |
| First-stage design | Unbalanced piston |
| Second-stage design | Standard downstream |
| High-pressure ports | 1 × 7/16 in UNF |
| Low / medium-pressure ports | 4 × 3/8 in UNF |
| Cold-water suitability | Warm water above 10°C |
| Breathing adjustment | Venturi adjustment |
| Intermediate pressure | 9.5–10 bar |
| First-stage weight | DIN: 435 g; INT/yoke: 600 g |
| Second-stage weight | 149 g without hose |
| Connection pressure rating | DIN 232 bar; INT/yoke 232 bar |
Based on Cressi product information.
| Type | Din, Yoke |
|---|
Cressi AC5 Zen Regulator
| Type | Din, Yoke |
|---|
Official manufacturer instructions for this product.
Cressi Bags and Backpacks User Manual
Cressi Regulators User Manual - Revision 18, 2026
Cressi Regulators Read First Safety Instructions - Revision 18, 2026
Read the manual before use. For firmware updates, follow the manufacturer support link. Our team can help during business hours.
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.
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.
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.
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?
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 is separate from dispatch time and depends on your location and the carrier. Read our shipping information.
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.
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