DGX Premium Doubles Bands Set w/Bolts for 5.5-Inch Cyl

$99.00
In Stock
SKU
DX-705555
These DGX premium quality Heavy-Duty Double Tank Bands for 5.5-inch diameter cylinders offer standard 8.5-inch center to center manifold spacing, so no special manifold is required.

The 5.5-inch bands offer excellent material quality and strong construction, but the cosmetic appearance of the welds is not as good. Your complete satisfaction is our goal, so please consider carefully before purchase.

DGX Premium Doubles Bands Set w/Bolts for 5.5-Inch Cyl

Doubles Bands Set w/Bolts for {5.5 in | 14 cm} Cylinders
Doubles Bands Set w/Bolts for {5.5 in | 14 cm} Cylinders
  • ONLY compatible with 5.5-inch diameter cylinders
  • Heavy duty bands are marine grade stainless steel
  • Standard 8.5-inch center to center manifold spacing
  • 5/16-18 all-thread headless bolts fit ANY backplate

The bolts, nuts and washers included with these bands are also all made of stainless steel. The 5/16-18 all-thread headless bolts provide the option to adjust their bolt height. The 5.5-inch diameter DGX premium quality Heavy-Duty Double Tank Bands are used with the Faber steel LP50's, LP45's, as well as aluminum AL30's and AL40's. They are approximately 2.2 inches wide . For metric cylinders use the 5.5-inch bands on the 7L and 5L cylinders.

Assembling a set of doubles is easy if you follow the detailed instructions we provide.

Choose the Appropriate Size Tank Bands and Bolts Kit for Your Cylinders

Diameter Cylinders
5.5 in AL30, AL40, LP45, LP50
6.7 in MP71, FX71, most early 2250 psi steel cylinders
7.25 in AL72, AL80, LP80, LP85, All HP E7/X7/F7's
8 in AL100, LP95, LP104, LP120, All HP E8/X8/F8's

The 8.0-inch bands and bolts fit the larger 8-inch diameter cylinders such as aluminum 100's or steel LP95's, LP104's, HP117's and HP133's. The 7.25-inch bands and bolts fit the more common, 7.25-inch diameter cylinders such as aluminum AL80s or steel HP100's. The 7.25-inch bands and bolts also fit the 7.0-inch diameter LP85's and the 6.9-inch diameter AL72's, with the bolt height adjustment depending on the depth of the "V" in the backplate. The adjustable height bolts in the 7.25 bands and bolts kit will work fine on these slightly narrower cylinders.

Occasionally, we are able to source bands and bolts kits for some specialized cylinder sizes: The 6.7-inch diameter bands fit the early 2250 psi cylinders such as PST steel LP72's, as well as the modern Faber MP71's and FX71's. The 5.5-inch diameter bands are used with the Faber steel LP50's. See "You May Also Be Interested In... " below for these unusual size bands.

For metric cylinders use the 8-inch bands on 18L and 15L cylinders, 7.25-inch bands on 12.2L, 10.5L and 9L cylinders, and 5.5-inch bands on the 7L and 5L cylinders.

More Information
Brand DGX Gears
SKU DX-705555
Weight 3.750000

Evolution of Manifolds and Bands

In the early 1980's there were few double tank manifolds available. Divers had a choice of a dual outlet metal-to-metal seal manifold from one manufacturer or a single outlet double barrel o-ring seal manifold from another manufacturer. Manifolds during this period did not have crossbars with isolation valves. The center-to-center spacing on these manifolds was for the 6.7-inch diameter steel 72s and the 7.25-inch aluminum 80s, which was tight for the increasingly popular 8-inch diameter steel 95s and 104s. The tight spacing meant bolts could rub against the tanks and the bands were prone to gapping.

In the late 1980s, more dual outlet manifolds became available with several choices for seal design and centers spacing. Specialty band manufacturers also entered the market and offered a variety of band sizes and types for use with different manifolds and tanks. Some manufacturers used tack welds that would allow the bands to flex in accordance with the size of the tank, rather than manufacture multiple sets of bands. The tack weld approach required care during assembly because the welds would separate if the assembler were to over-torque the bolts.

By the 1990s, valve manufacturers began to standardize manifold centers spacing and isolation valve crossbars became the norm. The double barrel seal manifold became the preferred design, providing better shock absorption and redundancy over the metal-to-metal seal manifolds. Tack welded bands became obsolete, the tack welds replaced by rigid structural plates.

Today, the new generation adjustable 8.5-inch center-to-center spacing manifolds provide up to 0.25-inch of adjustability so that tank bands fit properly even when there are minor variations in tank dimensions. If you have a manifold with double o-ring seals and adjustable spacing, you should not need a specialized tank band. Our article Assembling Double Cylinders makes it easy.

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