AlumiConn Connectors: 2-Port vs. 3-Port and Aluminum Wiring Repair Options
Choosing an AlumiConn connector starts with the connection: which conductor materials and sizes are present, how many conductors must join, and how much room the enclosure provides. King Innovation offers both 2-port and 3-port AlumiConn connectors, with pack quantities for individual purchases and larger projects.
This guide explains the product line and the questions to discuss with a qualified electrician. For models and current pricing, shop AlumiConn aluminum-to-copper wire connectors.
What is an AlumiConn connector?
AlumiConn is a mechanical wire connector with a tin-plated lug, nickel-plated set screws and a separate port for each conductor. King Innovation lists compatible aluminum-to-copper, aluminum-to-aluminum and copper-to-copper connections. The ports contain corrosion inhibitor to help resist oxidation.
Although shoppers sometimes search for “AlumiConn wire nuts,” these are pressure-screw connectors, not twist-on wire nuts. That distinction matters: wire preparation, conductor placement and tightening must follow the AlumiConn instructions rather than a method intended for a different connector.
2-port vs. 3-port AlumiConn: which should you choose?
Choose the port count for the number of conductors in the complete connection. Each port accepts only one conductor. A 2-port connector accommodates two conductors; a 3-port connector provides room for three. Pack quantity is a separate number describing how many connectors you receive.
| Selection point | 2-port AlumiConn | 3-port AlumiConn |
|---|---|---|
| Conductor capacity | One conductor in each of two ports | One conductor in each of three ports |
| Example connection | One compatible aluminum conductor and one copper pigtail | Two compatible aluminum conductors and one copper pigtail, when appropriate to the wiring arrangement |
| Pack quantities | 10, 25, 100, 1,000 and 2,500 | 2, 10, 25, 100, 1,000 and 2,500 |
| 10-pack model | 95015 | 95110 |
| 100-pack model | 95035 | 95135 |
These examples describe conductor counts, not a wiring diagram. Hot, neutral and grounding conductors must not be combined into one connection. Your electrician should identify each circuit connection, determine the appropriate connector and confirm enclosure space.
Supported wire sizes and specifications
King Innovation's 2-port revision D and 3-port revision Q specification sheets list the following limits:
- Aluminum: #12–#10 AWG solid.
- Copper: #18–#10 AWG solid or stranded.
- Maximum voltage: 300V.
- Temperature rating: 105°C.
- Listing: UL 486C pressure-screw-type wire connector.
- Use: one conductor per port; do not reuse.
A wire size outside the listed range is not covered by these specifications. For example, the listed aluminum range does not include stranded aluminum. A temperature rating also does not establish suitability for a wet location or direct burial. Select a connector specifically rated for its installation environment; see our waterproof connector collection for landscape wiring applications and verify each product's rating.
AlumiConn vs. COPALUM: understanding the repair options
AlumiConn and COPALUM use different connection methods. AlumiConn uses individual set-screw ports. COPALUM uses a specialized crimp connection and installation tooling.
In its June 2011 Repairing Aluminum Wiring publication, the U.S. Consumer Product Safety Commission discusses replacing aluminum branch-circuit wiring with copper, the COPALUM repair method, and AlumiConn as an acceptable alternative when COPALUM repair is unavailable. The publication calls for AlumiConn repair to be performed by a qualified electrician and describes manufacturer training requirements for COPALUM installers.
This is a dated source explaining the agency's published repair guidance, not a guarantee that any particular installation meets local requirements. Your electrician should assess the existing wiring, the full scope of repairs and applicable code requirements. Buying connectors alone does not establish that a home's aluminum wiring has been comprehensively repaired.
Why torque and the exact installation instructions matter
AlumiConn set screws require controlled tightening. King Innovation specifies different torque values according to conductor material and size, and warns that failure to follow the torque instructions can cause connector failure. “Tight enough” by feel is not a substitute for the manufacturer's procedure.
Have a qualified electrician follow the instructions supplied with the connector, including power isolation, conductor preparation, seating, tightening and lid closure. Do not reuse a connector. Download the model-specific manufacturer documents hosted by Atlantic Lighting:
- 2-port AlumiConn specifications and installation instructions — revision D
- 3-port AlumiConn specifications and installation instructions — revision Q
How to choose a pack quantity
Start with the electrician's connection count rather than the number of outlets alone. One electrical box can contain several separate connections, and the required count depends on the wiring arrangement. There is no universal number of AlumiConn connectors per outlet that fits every project.
- Count the individual connections requiring a connector.
- Separate the connections that need two ports from those that need three.
- Choose pack quantities for each connector type.
- Compare the current pack price divided by the number of connectors to calculate cost per connector.
For smaller quantities, consider the 95104 3-port 2-pack, 95015 2-port 10-pack or 95110 3-port 10-pack. The 95025 and 95125 models provide 25 connectors per pack. Larger 100-, 1,000- and 2,500-connector packs are listed in the complete AlumiConn model comparison.
Frequently asked questions
Can AlumiConn join aluminum wire to copper wire?
Yes, within the conductor materials, sizes and other conditions specified by King Innovation. These models list #12–#10 AWG solid aluminum and #18–#10 AWG solid or stranded copper.
Does “3-port, 10-pack” mean 30 connectors?
No. It means ten connectors, each with three individual conductor ports.
Can two wires share one AlumiConn port?
No. King Innovation specifies one conductor only per port.
Can I reuse an AlumiConn connector?
No. Both manufacturer specification sheets say not to reuse the connector.
Is the largest pack always the lowest cost per connector?
Compare current prices for the port count and quantity you need. Calculate price per connector from the actual pack price rather than assuming the largest package offers the lowest unit cost.
Compare all AlumiConn connectors and current pack pricing.
Technical sources: King Innovation 50100-87 revision D (06/23), King Innovation 50100-46 revision Q (06/23), and CPSC Publication 516 (June 2011). Sources reviewed October 6, 2026.
Planning a renovation? Read when to use AlumiConn in house and apartment remodels for practical use cases and questions to discuss with your electrician.
- Jenny Branch