Sherwood Aluminum 100 CF Scuba Tank in Yellow

Sherwood Aluminum 100 CF Dive Tank: A Full-Size Aluminum Cylinder for Recreational Diving

The Sherwood Aluminum 100 CF is a standard recreational scuba cylinder. It holds 100 cubic feet of compressed air at a working pressure of 3,300 psi, making it one of the larger single-tank options a recreational diver can choose.

If you dive regularly and want a personal cylinder rather than relying on rental gear, this is the size most dive operations and liveaboards are built around.

What You Are Getting

This is an aluminum cylinder, not steel. That distinction matters when you are picking it up, loading it into a car, or clipping it into your BCD (buoyancy compensator device, the vest-style jacket that holds your tank on your back).

Aluminum is more buoyant than steel, which means this cylinder will become slightly positively buoyant near the end of a dive as you consume the gas inside. Most recreational divers manage this easily with a small amount of weight adjustment, but it is worth knowing before you buy.

The cylinder ships with an NPT-threaded valve. NPT (National Pipe Thread) is the standard fitting used in North America, so filling it at any dive shop or fill station on the continent should be straightforward.

The Numbers That Matter

At 46.2 lbs, this cylinder is on the heavier end for a single aluminum tank. It is manageable for most adults on land, but worth thinking about if you regularly carry your own gear down a boat ladder or over a rocky shore entry.

The 30.3-inch total length (valve included) is a standard fit for most BCDs designed around a 100 CF cylinder. If you already own a BCD, confirm it is rated for a tank this size before purchasing.

Why 100 Cubic Feet

A 100 CF cylinder gives you more bottom time than the more common 80 CF aluminum tank, which is the rental standard at most dive shops. That extra gas is useful if you are a heavier breather, if you dive deeper recreational profiles, or if you simply want the margin that comes with starting a dive with more in reserve.

The trade-off is weight and bulk. If you travel frequently with your gear, an 80 CF tank is easier to manage logistically. This cylinder is better suited to divers who have a home base, a regular boat, or their own transport.

Who This Tank Is For

This cylinder suits a recreational diver who dives often enough to justify owning their own tank and wants the capacity to support longer or slightly deeper dives within recreational limits.

It is a straightforward choice if you dive locally, fill at a shop you trust, and want a reliable, full-size cylinder without the added complexity of a steel tank.

Who Should Look Elsewhere

• Travel divers who fly frequently will find this cylinder impractical. Tanks cannot be flown commercially with gas inside, and the weight adds up quickly when combined with the rest of your kit.
• Smaller-framed divers may find 46 lbs difficult to handle comfortably on entries and exits, particularly on shore dives.
• Technical divers running doubles or sidemount configurations typically prefer steel cylinders for their negative buoyancy characteristics and higher pressure ratings.

A Note on Inspection and Fills

Any scuba cylinder, including this one, requires a visual inspection (VIP) every year and a hydrostatic pressure test every five years before a fill station will fill it. If this is your first personally owned tank, factor that into your ownership plan. Your local dive shop can walk you through the schedule and handle both services.

The cylinder arrives in yellow, which is a practical color for visibility on a boat deck or in low-light conditions near an entry point.