Hollis Regulators

Hollis Regulators — Built for Extreme Environments

Hollis regulators carry the same philosophy that runs through the rest of the brand: build for the conditions where failure isn't an option, then let that engineering benefit every diver who uses it. The lineup spans accessible first stages through the distinctive 500SE side-breathing second stage — a configuration that has made Hollis a recognized name among technical and cave divers who need regulators that perform identically no matter how the second stage is oriented in the water.

At DiveCatalog.com, we carry the current Hollis regulator lineup as an authorized dealer: first stages, second stages, complete sets, and service kits for every major model.

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The Hollis Regulator Range

First Stages — DC1, DC3, DCX, DC7

Hollis's first stage lineup progresses from accessible entry models through the DC7, a proven first stage available in both Yoke and DIN configurations and the core of Hollis's most popular complete regulator sets. The DCX sits in the middle of the range, offering a step up in performance over entry first stages. All first stages have dedicated service kits available, supporting long-term ownership and maintenance.

500SE — The Side-Breathing Second Stage

The 500SE is one of Hollis's most distinctive products — a second stage that can be used from the left side, the right side, or even upside down without any change in breathing performance. This flexibility matters in technical and sidemount configurations where regulator hose routing and orientation vary by setup, and it's a regulator widely respected in the cave and technical diving community for exactly this reason. Sold with or without hose, plus a dedicated service kit.

150LX and 200LX Second Stages

The 150LX and 200LX are Hollis's primary recreational-to-technical second stages, available standalone or as complete sets paired with the DC7 first stage (150LX DC7 and 200LX DC7, both in Yoke and DIN). The 200LX represents Hollis's higher-performance second stage tier, suited to divers who want a noticeably smoother breathing experience at depth.

HO2 — Oxygen-Clean First Stage

The HO2 "Bulletproof" first stage is Hollis's oxygen-clean regulator, purpose-built for nitrox and technical gas configurations where oxygen compatibility is a hard requirement. Available in DIN, and offered paired with the 150LX second stage as a complete oxygen-clean set.

Complete Regulator Sets

Hollis offers several pre-matched first and second stage combinations — 150LX DC7, 200LX DC7, and the 150LX + HO2 oxygen-clean configuration — in both Yoke and DIN, simplifying the process of building a complete, properly matched regulator system rather than pairing components individually.

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Choosing Your Hollis Regulator

Diver Type	Recommended Regulator	Key Reason
Recreational divers wanting reliable performance	150LX DC7 or 200LX DC7 Set	Proven, well-matched complete set; Yoke or DIN available
Technical and sidemount divers	500SE	Side-breathing design works from either side or upside down
Nitrox and technical gas divers	HO2 oxygen-clean first stage	Built specifically for oxygen compatibility requirements
Divers wanting maximum breathing performance	200LX second stage	Hollis's higher-tier second stage for smoother breathing at depth

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Why Buy Hollis Regulators from DiveCatalog.com?

• Authorized Hollis dealer — genuine products, full manufacturer warranty
• Full range available — first stages, second stages, complete sets, and service kits
• Expert advice — our team can help you choose and match the right first and second stage
• Fast shipping — in-stock items ship within one business day
• Rewards program — earn points on every purchase

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Frequently Asked Questions — Hollis Regulators

What makes the 500SE different from a standard second stage?

It's designed to breathe identically from the left side, right side, or even upside down — a side-breathing configuration valued by technical and sidemount divers whose hose routing and regulator orientation vary by setup, unlike a standard second stage tuned for one specific orientation.

What is the difference between 150LX and 200LX?

The 200LX is Hollis's higher-performance second stage tier, generally offering smoother breathing characteristics than the 150LX. Both are available standalone or paired with the DC7 first stage as complete sets.

Do I need an oxygen-clean regulator for nitrox?

For nitrox blends up to 40% oxygen, most standard recreational regulators rated for nitrox are sufficient — always confirm your specific regulator's nitrox rating. For higher oxygen percentages or full technical gas mixing, an oxygen-clean first stage like the HO2 is specifically built to meet that requirement.

How often should I service my Hollis regulator?

Regulators should generally be serviced annually or per the manufacturer's recommended interval, regardless of how much they've been used, since rubber and seal components degrade over time even in storage. Hollis service kits are available for every major first and second stage model — service should be performed by a qualified technician.

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Browse the full Hollis regulator collection above and reach out if you'd like help choosing and matching the right first and second stage for your diving.