FOR AUTOMOTIVE USE ONLY

• Only intended to be used in Engine to allow maximum coolant capacity. 

• If dark inside engine bay, use Maglite Dcell flashlight to see how deep the plug is seated. 

• Brand New Sealed power 381-3178 / 555-104 plugs included (MADE IN USA) 

• formed and center punched to allow maximum coolant capacity in engine when installed.

• Dcell Maglite can be used to help with installation. 

*** Dorman 555-104 branded plugs available on request. (Made in China)