What is the wrench size to use on these plugs (Onan 167-1638 HGJAA/HGJAB/HGJAC Spark Plug)

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Onan 167-1638 HGJAA/HGJAB/HGJAC Spark Plug Questions & Answers

Onan 167-1638 HGJAA/HGJAB/HGJAC Spark Plug

The Onan Spark Plug is a replacement plug for Onan Generators.

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