Fill NF Type C / ExelTop™ Cylinders on the CGA-580 Racks You Already Have

The FasTest G-Series Adapter solves a specific, expensive problem for a gas filler: it lets you fill NF Type C cylinders — including ExelTop™-valved cylinders — on your existing CGA-580 fill racks, without building or buying new fill equipment. The adapter bridges a CGA-580 connector to an NF Type C valve, so the rack you already run for nitrogen, argon, helium, and other inert gases can now fill a different valve standard too.

The bridge works in two directions at once. On the rack side, a CGA-580 female termination port receives the CGA-580 connector (part G5800419CRP), which the adapter is proven to work with. On the cylinder side, it connects to the NF Type C valve and — crucially — actuates that valve’s residual pressure valve. NF Type C and ExelTop™ valves hold a small positive pressure in the cylinder to keep air and moisture out; to fill, that residual pressure valve has to be opened. The adapter’s lever-actuated RPV pin does exactly that, so filling proceeds without defeating the contamination protection the RPV exists to provide.

It is built for the safety and the volume of a fill line. A positive-pressure safety latch prevents removal under pressure, so the adapter cannot be taken off a pressurised cylinder; the RPV pin has an integrated sleeve-lock safety feature; and an ergonomic sleeve quick-connect actuation makes the connection with a simple motion, designed to reduce the repetitive strain that high-volume filling can cause. The adapter is rated from vacuum to 3600 psi (248 bar), for nitrogen and inert gases.

The value is flexibility without capital. Rather than investing in dedicated NF Type C fill equipment to serve ExelTop™ or other NF Type C cylinders, a filler adds the adapter to the CGA-580 racks already on the floor — which is the whole reason the product exists.

The Problem the FasTest G-Series Adapter Solves

Filling a different valve standard than your racks were built for normally forces a choice between expensive options — the adapter removes it:

• New cylinder standards, existing racks: A filler with CGA-580 racks that needs to fill NF Type C / ExelTop™ cylinders would otherwise need new, dedicated fill equipment. The adapter lets the existing racks do the job.
• The RPV has to be opened to fill: NF Type C / ExelTop™ valves keep a residual positive pressure to prevent contamination, so filling requires actuating the RPV pin. The adapter’s lever-actuated pin does this as part of the connection.
• Filling is high-pressure and repetitive: Gas filling is done under high pressure and in volume. The design needs a safety latch that prevents removal under pressure and an ergonomic actuation that spares the operator repetitive strain.
• Safety cannot be optional: A connection that could come off a pressurised cylinder is a serious hazard. The positive-pressure safety latch and the RPV pin’s sleeve lock build the safeguards into the tool.

The FasTest G-Series Adapter answers each: it fills NF Type C / ExelTop™ cylinders on existing CGA-580 racks, actuates the RPV pin to fill, and does so with a positive-pressure safety latch, a sleeve-lock RPV feature, and ergonomic quick-connect actuation, to 3600 psi.

Key Features 

CGA-580 to NF Type C — Used With the G5800419CRP Connector

The adapter is used with the CGA-580 connector (G5800419CRP) and has a CGA-580 female termination port that receives it, then connects to the NF Type C valve on the cylinder side. That is the bridge: CGA-580 rack to NF Type C cylinder, with proven compatibility with ExelTop™ valves.

Lever-Actuated RPV Pin

NF Type C and ExelTop™ valves include a residual pressure valve that keeps a small positive pressure in the cylinder to prevent air and moisture ingress. To fill, that valve must be opened — the adapter’s lever-actuated RPV pin does so, with an integrated sleeve-lock safety feature so the pin is not left actuated inadvertently.

Positive-Pressure Safety Latch

A positive-pressure safety latch prevents the adapter from being removed while the cylinder is under pressure. On a high-pressure gas fill, that is the essential safeguard: the operator cannot take the connection off a pressurised cylinder.

Ergonomic Sleeve Quick-Connect Actuation

The connection is made with an ergonomic sleeve quick-connect actuation — a simple sleeve motion rather than a threaded fitting — designed to reduce the repetitive motion that leads to strain injuries on a high-volume fill line, where connections are made over and over through a shift.

Rated to 3600 psi, Nitrogen and Inert Gases

The adapter is rated from vacuum to 3600 psi (248 bar) and is designed for nitrogen and inert gases — the CGA-580 gas family (nitrogen, argon, helium, and other inert gases).

Technical Specifications

Where the FasTest G-Series Adapter Is Used

Gas Fillers Serving NF Type C / ExelTop™ Cylinders

Its core use is at a gas filling operation that runs CGA-580 racks and needs to fill NF Type C / ExelTop™ cylinders — the adapter lets them do so on the existing racks rather than investing in dedicated NF Type C equipment.

Nitrogen, Argon, Helium and Inert Gas Filling

Because it works with the CGA-580 inert-gas family, it applies wherever those gases are filled — nitrogen, argon, helium, and other inert gases — into NF Type C / ExelTop™ cylinders.

Adding Cylinder Compatibility Without New Racks

More broadly, it is the tool for a filler that needs to extend the cylinder standards it can serve without a capital project — adding NF Type C / ExelTop™ capability to a CGA-580 line through an adapter.

Compressed Gas / Industrial Gas Filling

The adapter belongs to FasTest’s compressed gas fill connector line, so its home is industrial gas filling — the racks and fill stations that charge high-pressure cylinders for the inert-gas market.

G-Series Adapter vs. Dedicated NF Type C Fill Equipment

Frequently Asked Questions

Q: What is the FasTest G-Series Adapter?

A: It is an adapter that lets a gas filler fill NF Type C cylinders — including ExelTop™-valved cylinders — on existing CGA-580 fill racks. It bridges a CGA-580 connector to an NF Type C valve and actuates the valve’s residual pressure valve so the cylinder can be filled, without dedicated NF Type C equipment.

Q: Can I fill NF Type C / ExelTop cylinders on my CGA-580 rack?

A: Yes — that is exactly what the adapter is for. Used with the CGA-580 connector G5800419CRP, it connects your CGA-580 rack to an NF Type C valve (proven compatible with ExelTop™), so you can fill those cylinders on the racks you already have.

Q: What is the RPV pin for?

A: NF Type C and ExelTop™ valves have a residual pressure valve that keeps a small positive pressure in the cylinder to prevent contamination. To fill, that valve must be opened. The adapter’s lever-actuated RPV pin opens it, with an integrated sleeve-lock safety feature so it is not left actuated inadvertently.

Q: What connector does the adapter use?

A: The CGA-580 connector, part number G5800419CRP. The adapter’s CGA-580 female termination port receives it, and the adapter then connects to the NF Type C valve.

Q: Can the adapter be removed under pressure?

A: No. A positive-pressure safety latch prevents removal while the cylinder is under pressure — the essential safeguard on a high-pressure gas fill.

Q: What gases and pressures does it handle?

A: Nitrogen and inert gases — the CGA-580 family, including argon and helium — from vacuum to 3600 psi (248 bar).

Q: Is this a generic compressed gas adapter?

A: No. It is a specific adapter for filling NF Type C / ExelTop™ cylinders on CGA-580 racks. If you need a different connection or a different CGA standard, contact FasTest — the compressed gas fill connector line covers a range of connections, and this adapter is the one for the CGA-580-to-NF-Type-C bridge.

Q: Why use an adapter instead of dedicated NF Type C equipment?

A: Cost and flexibility. Dedicated NF Type C fill equipment is a capital investment; the adapter lets an existing CGA-580 line fill NF Type C / ExelTop™ cylinders without one. For a filler adding NF Type C capability to a CGA-580 operation, the adapter is the far lower-cost route.

Q: What is the ergonomic benefit?

A: The sleeve quick-connect actuation makes the connection with a simple sleeve motion rather than a threaded fitting, which is designed to reduce the repetitive motion that causes strain injuries on a high-volume fill line.

Q: What industries use the G-Series Adapter?

A: Compressed gas and industrial gas filling — operations that fill high-pressure nitrogen and inert-gas cylinders and need to serve NF Type C / ExelTop™ cylinders on CGA-580 racks.