Does the Delta 5 Regulator support nitrox mixtures with up to 40% oxygen?

To ensure this holds for your setup, confirm your gas mix does not exceed 40% oxygen and that your first stage regulator—the primary valve that supplies air to the hose—is also rated for these concentrations.

Delta 5 Regulator supports nitrox mixtures with up to 40% oxygen

The Delta 5 Regulator is Nitrox compatible up to 40% oxygen by volume, meaning it can handle the higher oxygen levels found in enriched air without requiring special preparation or cleaning of the internal O-rings (the rubber seals that maintain airtight connections). Because high-oxygen mixes can affect the structural integrity of seals, it is vital that you verify your specific gas blend stays within this 40% limit. We included this model in our comparison of the second stage regulators we evaluated because it provides a straightforward solution for mixed-gas diving. While the 5.0 rating from 6 buyers provides context, a sample that small settles nothing regarding long-term reliability. This device functions as a mouthpiece and valve system that delivers air to a diver, specifically categorized as a second stage regulator.

You can find the technical data in our full Delta 5 Regulator specs.

What to Check Before Buying the Delta 5 Regulator

Before purchasing this unit for nitrox use, verify these technical points to ensure your breathing remains consistent:

For a side-by-side look, see how the Delta 5 Regulator compares.

• Confirm your nitrox blend does not exceed the 40% oxygen limit stated in the product facts.
• Check that your first stage regulator is compatible with your specific gas mix to prevent breathing resistance.
• Verify that your current diving profile does not require a specialized certification that this specific model lacks.
• Ensure your existing hose connections are compatible with the heat exchanger and dynamic airflow adjustment controls.

Evaluating the Delta 5 Regulator for Your Needs

The Delta 5 Regulator weighs 4.8 ounces, which is significantly lighter than the 8 to 12 ounces typically needed to keep a backmount rig balanced. If you require a high-performance engineering benchmark like the Apeks XTX or Scubapro S620 Ti for extreme flow requirements, you might look at alternatives that offer more complex internal geometries. However, for a diver seeking a reliable, lightweight option that handles standard nitrox mixes without extra maintenance, this model provides a clear path to compatibility.

Divers should consider if the Delta 5 Regulator fits sidemount.

If you need a straightforward regulator that handles up to 40% oxygen without requiring extra cleaning or specialized parts, the Delta 5 Regulator is a practical choice for your kit.

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Reviewed by the Scuba Forge editorial team. Scuba Forge writes these guides from the 65 most-reviewed second stage regulator listings in our retail dataset, not from manufacturer copy.