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.
⚠️ Symptoms That Bring You Here
- 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 Details & Specifications
- 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
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.
⚙️ Installation Notes
- 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
✓ Compatible Applications
Designed for copper refrigerant tubing in domestic refrigerators, freezers, and light commercial refrigeration systems where a 7mm-to-5mm reducing straight connection is required. Commonly used during compressor replacements, evaporator coil repairs, and refrigerant line splicing where brazing is not practical or permitted. Confirm tube OD measurements before ordering.
✅Compatibility & Cross Reference
Not sure about your model number? Call 1-877-899-7278 and we’ll help you confirm. All brand names are the property of their respective owners and are used for compatibility reference only.
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