Catalina Cylinders vs Luxfer
S40 vs L6X S80 P3404V Scuba Cylinder
Capacity, dimensions and valve compatibility before a brand preference.
Catalina Cylinders
LuxferScores are our editorial opinion of these models, based on features, suitability and ownership trade-offs—not hands-on test results. How we chose →
We’d pick the L6X S80 P3404V Scuba Cylinder.
We’d start with Luxfer L6X S80 P3404V Scuba Cylinder. Our full-size Luxfer pick when the 10.6-litre, M25-threaded specification fits the kit. Choose Catalina Cylinders S40 instead if its strengths are a better match: we like the slimmer 5.8-litre format when that size matches the gas plan and mounting. These cylinders may serve different gas-carrying jobs. Required capacity, approved pressure, dimensions and valve compatibility take priority over our editorial preference.
Which one suits you?
Catalina Cylinders S40
Product photo coming soon.
We like the slimmer 5.8-litre format when that size matches the gas plan and mounting. It is not a replacement for a full-size main cylinder simply because it is easier to carry.
Get to know this model →Luxfer L6X S80 P3404V Scuba Cylinder
Product photo coming soon.
Our full-size Luxfer pick when the 10.6-litre, M25-threaded specification fits the kit. Do not confuse it with the differently threaded P3405V.
Get to know this model →Specifications side by side
The details that matter, side by side. “Check with the brand” means we have not confirmed that detail.
| Detail | Catalina Cylinders S40 | Luxfer L6X S80 P3404V Scuba Cylinder |
|---|---|---|
| MaterialCheck with the brand | 6061 aluminium | Check with the brand |
| Water capacity | 5.8 L | 10.6 L |
| Air capacityCheck with the brand | 40 cu ft / 1132 L | Check with the brand |
| Service pressure | 3000 psi / 207 bar | 217 bar |
| Dimensions | 133.4 mm diameter × 645 mm length | 180 × 660 mm |
| Cylinder weight | 7.3 kg | 13.7 kg |
| Listed buoyancyCheck with the brand | -1.5 lb full; +0.7 lb at 500 psi; +1.4 lb empty | Check with the brand |
| Neck threadCheck with the brand | Check with the brand | M25 |
Showing all 8 specification rows.
What the differences mean when you buy
Capacity and service pressure
Catalina Cylinders S40
- Water capacity
- 5.8 L
- Air capacity
- 40 cu ft / 1132 L
- Service pressure
- 3000 psi / 207 bar
Luxfer L6X S80 P3404V Scuba Cylinder
- Water capacity
- 10.6 L
- Service pressure
- 217 bar
Keep internal water volume, nominal gas capacity and service pressure distinct. A model name can be a nominal designation rather than its precise published air volume. Compare the stated pressure basis and use a properly established gas plan; capacity differences cannot be converted into universal minutes of diving or emergency ascent time.
Dimensions, weight and mounting
Catalina Cylinders S40
- Dimensions
- 133.4 mm diameter × 645 mm length
- Cylinder weight
- 7.3 kg
- Material
- 6061 aluminium
Luxfer L6X S80 P3404V Scuba Cylinder
- Dimensions
- 180 × 660 mm
- Cylinder weight
- 13.7 kg
Check cylinder-body dimensions against compatible mounting equipment and the full valve arrangement. A lower-capacity cylinder may be longer but narrower than another. Listed cylinder weight is not necessarily the ready-to-use assembled weight with gas, valve and accessories. Verify what each measurement includes before planning transport or fitting.
Buoyancy through the dive
Catalina Cylinders S40
- Listed buoyancy
- -1.5 lb full; +0.7 lb at 500 psi; +1.4 lb empty
Luxfer L6X S80 P3404V Scuba Cylinder
Ask the brand about this detail before ordering.
Read full, partially depleted and empty buoyancy separately, preserving the sign and the stated measurement conditions. Cylinders with equal diameter or pressure can behave differently as gas is used. Use these figures as input to qualified equipment assessment rather than a direct ballast prescription or a reason to copy another diver’s setup.
A closer look at both
S40
The S40 is Catalina’s narrower 5.8-litre aluminium scuba cylinder, with a listed air capacity of 40 cubic feet at 207 bar. At 133.4 mm diameter and 645 mm cylinder length, it has very different proportions from an S80. Its size can be useful for a separately rigged cylinder where the required gas volume has been established.
What we like
We like the slimmer 5.8-litre format when that size matches the gas plan and mounting.
What would make us think twice
It is not a replacement for a full-size main cylinder simply because it is easier to carry.
More about the S40 →L6X S80 P3404V Scuba Cylinder
L6X S80 P3404V Scuba Cylinder is an aluminium cylinder with 10.6 L water volume and a 217 bar service-pressure specification. Its listed dry weight is 13.7 kg.
What we like
Our full-size Luxfer pick when the 10.6-litre, M25-threaded specification fits the kit.
What would make us think twice
Do not confuse it with the differently threaded P3405V.
More about the L6X S80 P3404V Scuba Cylinder →Four checks before you place an order
- Establish the required capacity for the intended role through appropriate gas planning before comparing size or weight.
- Confirm cylinder identity, current inspection condition, service pressure, valve and compatible connection with qualified support.
- Check body dimensions and assembled fit with the intended mounting equipment.
- Have buoyancy and the complete configuration assessed; do not infer a ballast change from one catalogue figure.
Ask for a quote for the complete kit, including the accessories you need. That makes the price comparison much more useful.
Price, accessories and owning the equipment
A cylinder purchase is more than the metal body. Valve configuration, inspection status, compatible service and fill access, shipping and any required mounting hardware affect its usefulness and total cost. Check current local requirements with qualified suppliers rather than assuming a foreign listing is immediately usable where you dive.
Buying used? Start with the cylinder markings, inspection history and the local shop that will fill it. Brand preference comes after those checks. Ask a qualified cylinder inspector about anything uncertain before paying.
How we scored these models & further reading
These are our subjective buying scores out of 100. We weigh the usefulness of the features, the intended diving or carrying job, and the compromises involved in owning the gear. They are not laboratory measurements, safety grades or customer averages. The verdict applies to the two named models, not everything either brand makes.
90–100: one of our first choices for the stated job. 80–89: a strong option with trade-offs. 70–79: a more specific fit. A different fit, camera, valve or dive plan can change which one you should buy.
Catalina Cylinders S40
Product details and further reading →Luxfer L6X S80 P3404V Scuba Cylinder
Product details and further reading →Questions worth settling
Can the smaller cylinder serve as bailout?
Its nominal capacity alone cannot answer that. The required gas depends on a specific plan, depth, conditions, breathing demand and applicable training. This comparison supplies documented dimensions and capacities; it does not approve either cylinder for a bailout role.
Which is the better buy for this particular comparison?
These cylinders may serve different gas-carrying jobs. Required capacity, approved pressure, dimensions and valve compatibility take priority over our editorial preference. Catalina Cylinders S40: It is not a replacement for a full-size main cylinder simply because it is easier to carry. Luxfer L6X S80 P3404V Scuba Cylinder: Do not confuse it with the differently threaded P3405V.
Our pick is where we would start. Choose the other model if its fit or features better match your setup—especially where a camera, valve, boot or exposure suit needs an exact match.
