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Aluminum Cylinders at Dive Gear Express

Features of All Aluminum SCUBA Tanks
from Dive Gear Express

  • Manufactured in North America
  • 6061 alloy, an aluminum-magnesium-silicon blend
  • Both U.S. DOT-3AL and Canadian TC-3ALM markings
  • 0.750-14 NPSM (3/4 NPS) threaded neck opening
  • Cylinder and valve are Nitrox Ready
  

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

Read How to Select a SCUBA Tank.

SCUBA Tanks must be hydrostatically tested every five years (60 months). The larger primary cylinders typically have a factory hydro date between 3 and 9 months old, but not more than 12 months old. Smaller cylinders may have a factory hydro date up to 24 months old as these are manufactured less frequently.

Our cylinders and valves are Imperial 3/4 NPS neck threads, NOT Metric M25 neck threads, and the valves have overpressure relief devices. The cylinders have US DOT and Canadian CTC markings suitable for use ONLY in North America. Our cylinders and valves are NOT CE approved and NOT suitable for use in the European Union. Cylinders are NOT marked appropriately for use in Australia and New Zealand.

Aluminum Cylinders at Dive Gear Express
Cylinder Brand† Service
Pressure		 Water
Volume		 True Air
Capacity		 Diameter
(inches)		 Height *
(inches)		 Weight *
(pounds)		 Buoyancy **
Full : 500psi (pounds)
Aluminum 6 Thunderbird 3000 psi ~0.8L 5.8 ft3 3.20 11.1 2.7 - 1.4 : - 0.0
Aluminum 13 Thunderbird 3000 psi ~2L 12.8 ft3 4.38 13.1 6.0 - 1.8 : - 0.9
Aluminum 19 Thunderbird 3000 psi ~3L 18.3 ft3 4.38 18.8 8.0 - 1.3: - 0.1
Aluminum 30 Thunderbird 3000 psi ~4L 29.1 ft3 5.25 19.3 12.3 - 1.5 : - 0.0
Aluminum 40 Thunderbird 3000 psi ~5L 38.8 ft3 5.25 24.9 15.3 - 0.7: + 2.5
Aluminum 72 Thunderbird 3000 psi ~10L 69.9 ft3 6.89 26.0 27.8 - 0.7 : + 2.8
Aluminum 80 Thunderbird 3000 psi ~11L 77.5 ft3 7.25 26.1 31.5 - 1.7 : + 3.4
† Metal Impact has been rebranded as Thunderbird, cylinders are otherwise identical.
* Height and weight is for cylinder only, i.e. less valve.
** Buoyancy specification is for cylinder and valve in seawater at 500 psi.
Specifications are NOMINAL and supplied by Thunderbird Cylinders as of 2022.
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