CGA-540 Adapter for Oxygen with QD Nipple

In Stock
CGA-540 Adapter for Oxygen with quick-disconnect nipple that mates with our booster and transfill deluxe hose kits.

CGA-540 Adapter for Oxygen with QD Nipple

CGA-540 Fitting
CGA-540 Fitting Side View CGA-540 Adapter for Oxygen with QD Nipple
  • Fits CGA-540 connectors found on bulk supply Oxygen gas cylinders
  • Does NOT fit CGA-870 pin indexed connector typically seen on small portable medical oxygen cylinders

This adapter fits CGA-540 connectors found on bulk supply Oxygen gas cylinders. However, the adapter does NOT fit CGA-870 pin indexed connector typically seen on small portable medical oxygen cylinders.

Our booster and transfill deluxe hose kits already include one of these, but if you are a blender who wants to maximize your supply and minimize fill times then you are cascade filling using several supply cylinders. Having an additional fitting with a quick disconnect on each supply cylinder makes cascading easier by enabling the rapid movement of the supply side hose from one bottle to the next in your cascade.

More Information
Brand DGX
SKU DX-701500-O2
Weight 2.000000
Tek Tip Warning Image WARNING

Oxygen-related fires and explosions can result in serious injury or death. According to our suppliers, these products are compatible with oxygen and factory cleaned for use with oxygen. Nonetheless, the 'clean state' of this equipment applies only prior to initial use. Thereafter, periodic inspection and cleaning are a necessity.

You must meticulously follow the recommendations of the US Department of Transportation (DOT), Compressed Gas Association (CGA), and other federal/state/local agencies, plus your training agency for equipment maintenance, handling, storage, labeling, filling, transport and use of compressed gases. Ultimately, you must make the final decision to assume all risks associated with the use of any compressed gases.

How do the grades of compressed oxygen differ?

Nearly all compressed oxygen gas produced in the US is what is known as USP quality, meeting or exceeding United States Pharmacopeia quality standards for human consumption. The gas itself is normally manufactured using cryogenic separation of air, resulting in a gas that is very close to pure oxygen: > 99.5% with the balance being inert gases, mostly argon. There are three grades of compressed oxygen gas widely sold in returnable supply cylinders with the CGA-540 dedicated oxygen connector on the valve: Aviation (aka ABO), Medical, and Industrial (aka Welding). As a practical matter, the differences in the three grades as sold today are not quality of the oxygen being put in the cylinder but rather the procedure used to fill the cylinder and, in the case of Medical grade, licensing or documentation requirements.

Industrial grade oxygen cylinders can be just topped up when refilling and, although unlikely, could be contaminated with other unknown gases that might have back-flowed into the cylinder during use or filling. Aviation and Medical grades must have the cylinder completely evacuated before every fill with each documented and traceable lot being tested for purity. Medical grade oxygen is legally regulated in the US by the Food and Drug Administration and filling a cylinder for medical use incurs some FDA licensing requirements for the cylinder fill station operator.

Medical oxygen is considered a drug, and thus requires a doctors prescription for the FDA licensed fill station operator to fill the cylinder. The FDA has granted an exception to the prescription requirement for medical cylinders marked as emergency use only, but they still should only be filled with USP quality oxygen and following FDA guidelines. To blend breathing gas mixtures for Nitrox and technical diving, most blenders use Aviation grade oxygen to avoid the FDA licensing requirements yet still use an oxygen grade suitable for human consumption.

Among divers, perhaps the most often debated topic about oxygen grades is should industrial grade oxygen be used for SCUBA applications. That's because welding oxygen is relatively cheap and brand name compressed gas suppliers usually fill oxygen cylinders from the same high quality source while following best practices regardless of grade. However, small welding supply operations are more likely to just top up their industrial grade oxygen cylinders from a local bulk supply and may not follow best practices. Unless the entire supply chain for each and every cylinder of oxygen can be trusted with absolute certainty, in our opinion using industrial grade oxygen for diving applications is a needless risk.

See also Helium Grades for Breathing Gases in Diving

For much more detail about types of oxygen, especially recommendations regarding applications found in diving and diving emergencies, read Oxygen: Concentrations, Grades, and Labels by Larry "Harris" Taylor, Ph.D.