Vulkan Lokring L13000638 Refrigerator Tube Straight Brass Reducing Connector 7/5 NR Ms
When a refrigerant line is damaged, kinked, or needs to be spliced during a compressor or evaporator replacement, the traditional fix requires a torch, brazing rod, nitrogen purge, and a certified technician. The Vulkan Lokring L13000638 eliminates all of that — it's a tool-free, flame-free straight reducing connector that creates a permanent, leak-proof joint on copper refrigerant tubing. The 7/5 NR Ms spec means it connects a 7mm tube to a 5mm tube using a nitrile rubber (NR) seal in a brass (Ms) body. No brazing, no open flame near refrigerant, no recovery required for the splice itself.
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Confirm the complete model number before ordering. Similar parts may use different connectors, dimensions, hose positions, electrical ratings, or mounting points.
- Refrigerant line kinked, cracked, or punctured during service — compressor or evaporator replacement
- Refrigerator not cooling after a repair — suspected refrigerant leak at a line joint
- Need to splice or extend a copper refrigerant line without brazing equipment
- Reducing connection required between two different tube diameters (7mm to 5mm)
- Flame-free repair required — working in a confined space or near flammable materials
- Previous brazed joint failed or is showing signs of leakage
- Part Number: L13000638
- Connector Type: Straight reducing connector
- Size: 7/5 NR Ms — 7mm inlet × 5mm outlet
- Body Material: Brass (Ms)
- Seal Material: Nitrile Rubber (NR) — compatible with common refrigerants
- Brand: Vulkan Lokring
- Application: Copper refrigerant tubing — refrigerators, freezers, HVAC/R systems
- Installation: Tool-free push-and-crimp — no brazing, no torch, no open flame
- Joint Type: Permanent mechanical seal — not reusable once crimped
- Skill Level: Intermediate to Advanced — refrigerant system work; recovery and recharge required
- Recover refrigerant before cutting or splicing any refrigerant line — required by law
- Cut tubing cleanly and squarely — a burr or angled cut will prevent a proper seal
- Deburr and clean tube ends before insertion — contamination compromises the nitrile seal
- Insert tube fully to the depth stop before crimping — partial insertion causes leaks
- No torch, flux, or brazing rod required — connector is flame-free by design
- Pressure-test the joint with nitrogen before recharging with refrigerant
- Joint is permanent once crimped — plan the splice location carefully before installation
Lokring connectors are sized by tube outer diameter (OD) in millimetres — not by refrigerant line "size" labels, which vary by manufacturer. The L13000638 connects a 7mm OD tube to a 5mm OD tube. Measure both tube ends with calipers before ordering. Using the wrong size connector will not seal properly and will result in a refrigerant leak after recharge. If both tube ends are the same diameter, you need a straight (non-reducing) connector instead.
Part Details
Use a qualified technician when diagnosis or installation is outside your experience. Gas parts should be installed by a licensed technician.
✅Compatibility & Cross Reference
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