This is a 7423 Champion Spark Plug RC12YC
Replaces
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AUTOLITE: 3924
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BRIGGS & STRATTON: 491055S, 992304
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CHAMPION: RC12YC
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JOHN DEERE: M78543
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KOHLER: 12-132-02-S
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NGK: BCPR6ES
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STENS: 131-015, RC12YC, 130-191, 130-526, 132-320, 130-118