Pro-source 4423R Mig Welder Nozzle Insulator

Product Description

The PRO-SOURCE 4423R is a replacement nozzle insulator designed for MIG welding guns. It fits wire outside diameters ranging from 0.03 inches to 0.094 inches, covering the most common solid and flux-core wire sizes used in shop and field welding applications. The insulator seats between the nozzle and the contact tip holder, providing electrical isolation and protecting the gun body from spatter and heat. Welders and maintenance technicians install this part during routine gun service or when the existing insulator shows cracking, burning, or deformation that can cause shorts and inconsistent arc performance.

This nozzle insulator is suited for light-duty to medium-duty MIG gun assemblies used in automotive, fabrication, and general manufacturing environments. It is a direct service replacement intended for technicians performing gun reconditioning or preventive maintenance on MIG welding equipment. With dimensions of approximately 1.1 inches in height, 1.1 inches in width, and 0.85 inches in length, it is compact and sized for standard replacement gun nozzle assemblies.

Key Features

• Compatible wire OD range: 0.03 inches to 0.094 inches
• Compact form factor: 1.1 x 1.1 x 0.85 inches
• Provides electrical isolation between nozzle and contact tip holder
• Protects gun body from spatter buildup and heat damage
• Lightweight at 0.018 pounds for easy handling during gun service

Compatibility

Designed as a replacement-style nozzle insulator for MIG welding guns accepting wire outside diameters between 0.03 inches and 0.094 inches. Verify nozzle thread pattern and insulator seat dimensions against your specific gun model before installation.

Installation Notes

Disconnect and power down the welder completely before servicing the gun assembly. Remove the nozzle and contact tip to access the insulator seat, then seat the replacement insulator firmly before reassembling components in reverse order. Inspect the contact tip and nozzle for wear or spatter buildup and replace as needed during the same service interval. Follow the welding equipment manufacturer's service guidelines and applicable workplace safety codes when performing gun maintenance.