Heavy-Duty Gray Barrel Liner (5-Pack)

Smooth, reliable aluminum wire feeding for compatible MK Products® welding guns.
The MK Products® Heavy-Duty Gray Barrel Liner is designed to reduce friction and support consistent aluminum wire delivery through the welding gun barrel. Built for demanding aluminum welding applications, this replacement liner helps maintain smooth wire feeding and dependable gun performance.

The Heavy-Duty Gray Liner supports select 4000 and 5000 Series aluminum wire sizes and is compatible with a wide range of MK Products® Python®, Cobra®, and Prince® welding guns.

Sold in packs of 5 liners.

Why Welders Choose the Heavy-Duty Gray Barrel Liner

• Designed for Aluminum: Engineered specifically for compatible aluminum welding wire.
• Reduces Wire Friction: Helps aluminum wire travel smoothly through the welding gun barrel.
• Consistent Wire Feeding: Supports stable wire delivery for dependable welding performance.
• Heavy-Duty Design: Built for durability in demanding aluminum welding applications.
• Genuine MK Products® Quality: Designed for compatible MK Products® push-pull and spool welding guns.
• 5-Pack: Keep replacement liners available for maintenance and production use.

Aluminum Wire Compatibility

Important: Select and use the liner according to the aluminum wire alloy series and diameter being fed through your welding gun.

Compatible Welding Guns

• MK Products® Python® X
• MK Products® Python®
• MK Products® Python® LX
• MK Products® Cobra® X
• MK Products® Cobra® X-HD
• MK Products® Cobra® MX
• MK Products® Cobra® MX-HD
• MK Products® Prince® XL
• MK Products® Prince® XL Spool Gun
• MK Products® Prince® X
• MK Products® Prince® SG Spool Gun

Compatibility Note: Verify your welding gun model and wire size before ordering to ensure Part #931-0145 is correct for your setup.

Why Barrel Liner Condition Matters

The barrel liner provides a controlled path for aluminum welding wire as it travels through the welding gun. Because aluminum wire is relatively soft, excessive friction or a worn liner can negatively affect wire delivery.

Keeping the correct liner in good condition helps support smooth feeding through the gun and reliable operation during aluminum welding.

When Should You Replace the Barrel Liner?

Inspect the liner as part of regular welding gun maintenance and whenever you experience changes in wire feeding performance. A worn, damaged, contaminated, or obstructed liner can contribute to inconsistent wire delivery.

Keeping replacement liners available is especially useful in production environments where minimizing welding gun downtime is important.

Ideal Applications

• Aluminum MIG welding
• Push-pull welding systems
• Spool gun welding
• Production aluminum fabrication
• Automotive and transportation fabrication
• Aerospace fabrication
• Welding gun preventive maintenance

Frequently Asked Questions

How many barrel liners are included?
These Heavy-Duty Gray Barrel Liners are sold in packs of 5.

What is the MK Products® part number?
The part number is 931-0145.

What type of welding wire is this liner designed for?
It is designed specifically for compatible aluminum welding wire.

What 4000 Series aluminum wire sizes are compatible?
The liner is designed for 3/64" through 1/16" 4000 Series aluminum wire.

What 5000 Series aluminum wire sizes are compatible?
The liner is designed for .030" and .035" 5000 Series aluminum wire.

Why is the correct liner important when welding aluminum?
Aluminum welding wire is relatively soft and requires smooth feeding through the gun. The correct liner helps reduce friction and supports consistent wire delivery.

Which welding guns are compatible?
The liner is compatible with the listed MK Products® Python®, Cobra®, and Prince® welding gun models. Verify your specific gun and wire configuration before ordering.

Is this a genuine MK Products® replacement part?
Yes. Part #931-0145 is a genuine MK Products® Heavy-Duty Gray Barrel Liner.