I-DIVE GoPro Ball Mount For Housings 
Cressi AC5 Zen Regulator
Original price was: $629.00.$511.20Current price is: $511.20. inc. GST
The Cressi AC5 Zen pairs an AC5 piston first stage with the lightweight Zen second stage for scuba diving in water above 10°C. Select the DIN or yoke connection. This listing does not include an octopus; choose an alternate air source separately.
- Description
- Technical Specs
- Additional information
- Shipping
- Returns & Exchanges
- Click & Collect
- Frequently Asked Questions
Cressi AC5 Zen Regulator
The Cressi AC5 Zen combines the AC5 unbalanced-piston first stage with a lightweight Zen second stage. It is listed for diving in water above 10°C and is available with DIN or yoke cylinder connection.
Key features
- AC5 first stage with four low-pressure ports and one high-pressure port.
- External intermediate-pressure adjustment intended for a qualified service technician.
- Zen second stage with a large purge button and adjustable Venturi control.
- Choose the first-stage connection that matches your cylinder valve.
What is included
This listing covers the AC5 first stage and Zen primary second stage. An octopus is not included. Choose a compatible alternate air source and pressure-monitoring equipment separately, and have the regulator assembled and serviced by a qualified technician.
Technical Specs
| Brand | Cressi |
|---|---|
| Main model / configuration | Cressi AC5 / Zen |
| Product type | Regulator |
| Regulator type | Primary Regulator |
| 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 |
| Regulator set weight | Not confirmed — catalogue total and component weights disagree |
| 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 |
Additional specifications
| 2nd stage weight (without hose) | 149 g |
|---|
- Unique to Cressi is the AC5’s external 1st stage IP adjustment system. This allows service centres to fine-tune the intermediate pressure while the regulator is attached to the cylinder, providing a quick fix to keep it in use until the next service interval. The high-capacity conical filter, which offers a larger surface area than traditional flat filters, traps impurities before they damage the internal components of the 1st stage.
- Balanced Diaphragm First Stage For Reliable Performance
- Optimized Airflow For Effortless Breathing At Any Depth
- Adjustable Venturi Effect For Personalized Breathing Resistance
- Certification EN 250/2014 A over 10°
- EN 250 A > 10°C
- The unbalanced piston 1st stage is simple, dependable and easy to maintain.
- 1 7/16” HP ports UNF
- 4 3/8” LP ports UNF
- Adjustable venturi maximises airflow in dive mode and prevents free-flows when the regulator is on the surface.
- Large purge button is easy for new divers to use.
Sources: Cressi 2027 Scuba Diving buyer’s guide; Current product information.
| Type | Din, Yoke |
|---|
We dispatch orders five days a week, usually within 1–3 days. 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.
We offer a 30-day exchange on most unused products within Australia when they are in saleable condition with their original packaging and accessories. Please contact us with your order number before returning an item. Change-of-mind refunds are not offered; this does not limit your rights for faulty products under Australian Consumer Law.
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.
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. If you are unsure, contact our team before ordering and we can help you choose.
How do I check availability?
Select your required options, such as colour and size, to see availability for that variation. If an item is marked “Available to order”, check the estimated dispatch information. Please contact us before ordering if you need gear by a particular date.
When will my order be dispatched?
Orders are usually dispatched within 1–3 days, subject to stock availability. Available-to-order and special-order products may take longer. 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?
We offer a 30-day exchange policy on most unused products within Australia, subject to eligibility. Contact us with your order number before returning an item. Read the exchange 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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