The NOS Cummins Power Generation 167-0272-99 GENERATOR PARTS RV 2pk Spark Plugs FS! are high-quality spark plugs designed for ignition systems in Onan Generators. These Onan spark plugs come in a set of 2 and are standard electrode type with a resistor. They are covered by a manufacturer's warranty and are compatible with Cummins generators. It's important to note that these spark plugs may contain chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Please refer to www.P65Warnings.ca.gov for more information.