Miller Oil Pressure Switch 4 PSI NO 1/8-28 BSPT

Protect Your Engine with the Miller 221485 Switch

Your engine-driven welder is the heart of your mobile operation, and oil is its lifeblood. The Miller 221485 Oil Pressure Switch is the watchdog that ensures your machine's engine has the pressure it needs to run safely. If your welder is shutting down unexpectedly or showing oil pressure faults, a faulty switch is often the culprit. Replacing it with this genuine Miller part ensures your machine reads the pressure accurately and keeps running when it should.

This switch is set to 4 PSI and features a Normally Open (NO) design, which is standard for many Miller safety circuits. It screws in with a 1/8-28 BSPT thread—make sure you check your manual or the old part, as this specific thread type is crucial for a tight, leak-free seal. Don't risk stripping out the port on your engine block by forcing in a standard hardware store NPT switch.

Maintenance is cheaper than an engine rebuild. A failing pressure switch might fail to shut down your engine if the oil pump quits, or it might prevent your perfectly good engine from starting at all. Swap in the Miller 221485 to restore reliable function and peace of mind. It's a small part that does a big job, keeping your welder ready to burn rod whenever you are.