166571 - Miller Coolant Fitting - 3/8 Barb to 5/8-18 Female Adapter

Keep Your Cool with Genuine Miller Parts

When your water-cooled TIG torch or MIG gun starts acting up, the culprit is often a small, overlooked connection. A leaky coolant fitting isn't just a messy annoyance—it's a threat to your expensive equipment. If your coolant levels drop or pressure is lost due to a bad seal, your torch can overheat in seconds, leading to costly burnout. The Miller 166571 Fitting is the exact replacement part you need to fix those leaks and get your cooling system back to 100% efficiency.

This adapter is designed to connect your standard 3/8-inch coolant hose directly to a 5/8-inch - 18 threaded port. It’s a common connection point found on many Miller water coolers and power sources. Because it is a genuine Miller product, you don't have to worry about it fighting the threads or not sealing correctly. It spins on smooth and grips the hose tight. Just slide your 3/8" tubing over the barbed end, secure it with a hose clamp, and screw the female threaded end onto your machine. It’s a five-minute fix that saves you hours of downtime.

Don't risk using generic hardware store fittings that might corrode or crack under the vibration of a welding shop. This fitting is built tough for the industrial environment. Whether you are setting up a new water-cooled rig or swapping out old, cracked hoses on a trusty Syncrowave or Dynasty, having the right fittings on hand makes the job easy. Keep your coolant flowing and your welds going with this essential replacement part.

Key Features:

• Perfect Fit: Designed specifically for Miller equipment with 5/8"-18 connections.
• Leak Prevention: Sharp barbs grip 3/8" tubing securely to prevent messy puddles.
• Durable: Made to withstand the wear and tear of daily shop use.
• Easy Install: Simple thread-on design gets you back to welding fast.