Thunderbird AL-40 Cylinder, Brushed No-Coat

As low as $190
In Stock
Experienced divers prefer the trim characteristics of the aluminum 40 size cylinder for deco, bailout and sidemount applications.

Prices for these cylinders do NOT include free shipping.

Questions? Cylinder FAQ and Valve FAQ

Thunderbird AL-40 Cylinder, Brushed No-Coat

Valve Type Options
Valve Type Options Cylinder Size Comparison Premium Valve Options Premium O2 Valve Options Neck Detail Sample VIP How We Pack a Cylinder for Shipment
  • Perfect size for stage, bailout and oxygen
  • Cylinder and valve are Nitrox Ready

Dive Gear Express ships your Nitrox Ready cylinder with the valve installed (domestic ground US only). Unless you select no valve, the valve included in our price is a very high quality DGX Premium Pro Valve in your choice of design, plus a DIN/K insert to make the valve suitable for use with both DIN or Yoke regulator fittings. The cylinders ordered with valves have a current month Nitrox Ready decal.

Our "DGX Complete" Setup Includes:

  • Nitrox Ready Cylinder
  • DGX Premium Pro Valve in choice of design and configuration
  • DIN/K Insert for use with Yoke regulator fittings
  • Spare O-ring for valve face
  • Valve Protector Cap
  • Current Nitrox Ready Decal †

† Our shop evidence of inspection 3" X 6" dated decal (aka "VIP sticker") states "this cylinder and valve are suitable for service with compressed gases containing greater than 23.5% oxygen." That means the cylinder and valve, prior to initial use, are oxygen clean and oxygen compatible. If you plan to use this cylinder with gases containing more than 40% oxygen then the upgrade to our DGX Premium Oxygen Valve is suggested. If you select the No Valve / No VIP option, then the VIP decal and dust cap is NOT included.

Questions? Cylinder FAQ and Valve FAQ

More Information
Brand Thunderbird Cylinders
Weight 15.550000

Customer Reviews


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
True Air †
Height *
Weight *
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.

†  Visit Calculating SCUBA Cylinder Free Gas Capacities for more information about True Capacity values.