Features of All Worthington X-Series Cylinders
- Hot-dip galvanized external finish
- Five-year limited warranty
- Both U.S. DOT-E14157 and Canadian TC-SU4957 markings
- 0.750-14 NPS (3/4 NPS) threaded neck opening
- Manufactured in North America
These cylinders are made at Worthington's state of the art manufacturing
facility in Tilbury, Canada. Worthington manufactures these cylinders using
deep-drawn chrome molybdenum steel resulting in a light weight cylinder
with excellent buoyancy characteristics.
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How to Select a SCUBA Tank
Our factual but easy-to-read article helps you make
this big decision by giving you information on:
- Aluminum tanks versus steel tanks
- Low-pressure tanks versus high-pressure tanks
- Tank paints, coatings, and finishes
- Tank dimensions and capacity recommendations
to read How to Select a SCUBA Tank.
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Worthington Cylinders at Dive Gear Express
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| Cylinder |
Service
Pressure
(psi) |
Diameter
(inches) |
Height
(inches) |
Weight
Empty
(pounds) |
Buoyancy
Full : Empty
(pounds) |
| X7 Steel 65 |
3442 |
7.25 |
16.7 |
25.1 |
- 8.7 : - 3.9 |
| X7 Steel 80 |
3442 |
7.25 |
19.7 |
28 |
- 9.0 : - 3.0 |
| X7 Steel 100 |
3442 |
7.25 |
24.0 |
33 |
- 10.0 : - 2.5 |
| X7 Steel 120 |
3442 |
7.25 |
28.0 |
38 |
- 11.0 : - 2.0 |
| X8 Steel 119 |
3442 |
8.00 |
24.0 |
42 |
- 10.9 : - 2.0 |
| X8 Steel 130 |
3442 |
8.00 |
25.5 |
43 |
- 11.7 : - 2.0 |
| Comparison Only - Aluminum 80 |
3000 |
7.25 |
26.10 |
31.4 |
- 1.4 : + 4.4 |
Buoyancy specification for cylinder and valve in seawater.
Height dimension is cylinder only, i.e. less valve.
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The Dive Gear Express "Deluxe Complete" Setup Includes:
- Cylinder w/Anti-Roll Boot
- Thermo Pro DIN/K Valve
- Spare Viton O-ring for Valve Face
- Valve Protector Cap
- Full Visual Inspection
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Dive Gear Express offers diving products labeled Nitrox Ready, whose oxygen-compatible components are free of hydrocarbons and other contaminants. All cylinders from Dive Gear Express are special order cleaned for oxygen service at the factory and sealed with an oxygen-compatible cap before shipment to us. We install an oxygen clean and oxygen compatible valve. With Dive Gear Express, you don't have to make
expensive aftermarket alterations to use oxygen-rich gas mixtures.
 to read
What Does Nitrox-Ready Mean?
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If shopping on-line, watch out for shenanigans. Some on-line retailers will 'low ball' a cylinder only price but then have exorbitant prices for the valve, or add shipping surcharges and 'cylinder handling fees' at the last step of checkout. Some cylinders purchased on-line may not include a VIP sticker, which means you'll pay extra at the local dive shop to have it inspected. Many low cost K-valves are not suitable for use with Nitrox. There are several other tricks we won't mention here, but you get the idea.
Look carefully at what Dive Gear Express includes in our cylinder prices. Both the cylinder and valve are Nitrox-Ready and say so on our VIP sticker. We install the valve with a Viton neck O-ring and oxygen-compatible lubricant; no VIP re-inspection fee is necessary before filling. Our price includes the better-quality Thermo Pro DIN/K valve with insert, protector cap, and spare Viton O-ring for valve face. Our price also includes FREE continental U.S. shipping, without any additional surcharges.
Variable Capacity of Cylinders
One idea we like is selecting a larger capacity cylinder and then deliberately under fill. For example the
X7-100 yields 89 cubic feet at 3000 psi, and the X8-119 yields 107 cubic feet at 3000 psi. That is plenty of gas
for most dives, puts an end to short fills, and the lower pressure is easy on equipment, yet allows the option of a
high-pressure fill when you need really need more gas. This is how divers have for years been using overfilling
with low-pressure cylinders, but with the advent of the large-capacity high-pressure cylinders, it eliminates the
concerns regarding overfills.
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| Cylinder |
2640 psi |
3000 psi |
3442 psi |
| X7 Steel 80 |
64 cu. ft. |
72 cu. ft. |
80 cu. ft. |
| X7 Steel 100 |
80 cu. ft. |
89 cu. ft. |
100 cu. ft. |
| X7 Steel 120 |
96 cu. ft. |
107 cu. ft. |
120 cu. ft. |
| X8 Steel 119 |
95 cu. ft. |
107 cu. ft. |
119 cu. ft. |
| X8 Steel 130 |
104 cu. ft. |
117 cu. ft. |
130 cu. ft. |
What Happened to Low-Pressure Cylinders?
Many experienced divers have preferred low-pressure cylinders because they are easier on regulators, have no short-fill concerns, and are more suitable for partial-pressure blending. More recently, the low-pressure 3AA cylinders (2640 psi, i.e., 2400 with a +) are being replaced by the new DOT exemption cylinders (3442 psi, no plus needed). That's because you can use the high-pressure 3442 psi cylinders as low-pressure 2650 psi cylinders if you prefer, simply by under filling. The 3442 psi DOT Exemption cylinders have the same length, diameter, and capacity at lower 2640 psi pressure as the 3AA cylinders. Even better, the empty weight of the new cylinder design has been reduced slightly, yet the buoyancy remains slightly negative when empty.
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