Uniweld
Nitro Flow Indicator FFINL x 1/4 in. MFOU
The Uniweld UNF3 is a compact nitrogen flow indicator for HVAC/R technicians who need a clear visual check that nitrogen is moving through copper lines during purging and brazing.
Technical snapshot
Key UNF3 details.
Built for nitrogen purging workflows where technicians need to confirm movement through the line before and during brazing.Nitrogen purging support
Confirm nitrogen is flowing before the joint is brazed.
The UNF3 gives technicians a direct visual reference while nitrogen is being used through copper refrigeration and air conditioning pipework. When the indicator ball rises, the technician can see that gas is moving rather than relying on static pressure alone.
- Helps confirm nitrogen movement during HVAC/R brazing and purging work.
- Supports cleaner copper pipe preparation by helping reduce internal oxidation and scale.
- Useful alongside nitrogen regulators during installation, repair and maintenance work.
- Compact field-service tool for refrigeration mechanics and air conditioning technicians.
- 1/4 in. female flare inlet and 1/4 in. male flare outlet for standard nitrogen setups.
What it helps check
Static pressure on a regulator does not always prove nitrogen is moving through the pipe. The UNF3 adds a visual check point between the nitrogen setup and the copper line.
- Nitrogen flow during copper line purging.
- Gas movement before brazing starts.
- Simple confirmation that oxygen is being displaced from the tube.
Purge, confirm, braze
A clear check point in the nitrogen line.
Use the UNF3 as a visible flow reference when nitrogen is connected for HVAC/R brazing. It helps confirm that the line has more than static pressure before heat is applied.
Fit the UNF3 into the nitrogen setup using the 1/4 in. flare inlet and outlet connections.
Open the flow and check for ball movement inside the clear tube before brazing begins.
Maintain suitable nitrogen flow through the copper line to help reduce internal oxidation and scale.
Set-up checks
Use it as part of a controlled nitrogen brazing setup.
The flow indicator sits in the nitrogen line and gives a quick visual reference, but correct regulator setup, hose condition and safe brazing practice still matter on every job.
- Inspect the indicator tube, fittings and seals.
- Confirm the regulator and hoses are suitable for nitrogen.
- Check the copper line is open to allow flow through the system.
- Use nitrogen only as directed by trade practice and site procedures.
- Do not use the indicator as a pressure regulator.
- Keep heat, flame and hoses controlled while brazing.
Related Uniweld products
Useful Omni Tools links.
Internal links to the Uniweld range and related brazing, hose and service connection products.Useful information & documents
UNF3 resources.
Omni product and range links, plus official Uniweld product information for the nitrogen flow indicator category.Omni Tools links
Manufacturer resources
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