Spark Plug Air Hose Adapter - 14, 18 mm Thread - Kit

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Reference Information

Air Hold Adapters, 14mm/ 18mm, 1/4 in. NPT Female Threads, for Spark Plugs, Pair

These Proform air hold adapters are designed to thread into your spark plug hole. Then, attach your air hose, and you'll be able to fill the cylinder with air for checking compression, checking leakdown, or even changing valve springs. They are manufactured from quality materials and will hold the air in so you can go to work on the cylinder heads.