The Lincoln Electric Magnum PRO 250LX Spool Gun 25 ft (K3570-2) is Lincoln’s professional-grade aluminum spool gun for Power MIG and Flex Feed welders equipped with a standard (non-GT) gun connector. The 25 ft cable and robust Magnum PRO drive system make it the go-to choice for shops that weld aluminum regularly and need consistent, reliable soft-wire feeding at production pace.
| Model | Magnum PRO 250LX Spool Gun |
|---|---|
| Part Number | K3570-2 |
| Cable Length | 25 ft (7.6 m) |
| Wire Diameter Range | 0.030 in – 3/64 in (0.8 – 1.2 mm) |
| Wire Capacity | 1 lb (4 in) small spools |
| Compatibility | Lincoln Electric Power MIG and Flex Feed welders with standard (non-GT) gun connector |
| Connector Type | Standard Lincoln gun connector (non-GT) |
| Vendor | Lincoln Electric |
- Aluminum MIG welding on Lincoln Power MIG welders: The Magnum PRO 250LX is the factory-recommended spool gun for many Lincoln Power MIG models. Its drive system handles aluminum wire cleanly, delivering consistent arc starts and stable bead quality on 4000- and 5000-series alloys.
- Aluminum boat and marine fabrication: 25 ft of cable reach combined with a 1 lb on-gun spool gives marine fabricators the mobility to weld around large hull sections without extending liners or battling push-feed consistency issues.
- Trailer, HVAC, and architectural aluminum: Any shop that welds thin or medium-gauge aluminum extrusions and plate — trailers, curtain walls, outdoor furniture — benefits from the spool gun’s reliable feeding of soft wire.
- Upgrade path for existing Lincoln users: Shops already using Lincoln Power MIG or Flex Feed equipment can add aluminum capability with the K3570-2 without purchasing a new welder or push-pull feeder system.
The K3570-2 uses Lincoln Electric’s standard (non-GT) gun connector — the same interface used by Magnum PRO MIG guns on many Power MIG and Flex Feed models. It is the version to choose when your Lincoln welder does not have a GT (Gun Trigger) port.
If your Lincoln welder has a GT connector, you will need the K3569-2 (Magnum PRO 250LX GT) instead — see that product listing. Using the wrong connector version will result in a non-functional trigger; confirm your machine’s gun port type before ordering.
Browse our full spool gun selection at the Spool Guns collection.
WeldingMart is an authorized Lincoln Electric distributor. Every K3570-2 sold through WeldingMart is a genuine Lincoln Electric product backed by the full manufacturer warranty. Our team knows the Magnum PRO spool gun line inside and out — including the critical GT vs. non-GT connector distinction — and can confirm the right part for your machine before you order. US stock, expert support, authentic Lincoln product.