New Generic Replacement RC12Y Spark Plugs. Manufactured and designed for use in small 4-stroke engines, including pressure washers, mowers, pumps, generators, shredders, and other outdoor equiptment. These replacement RC12Y spark plugs are compatible with top brands including compatible with Champion, compatible with Briggs Stratton, compatible with Craftsman, compatible with KOHLER, compatible with ARIENS, compatible with Gravely, compatible with MTD, and compatible with Husqvarna Each pack contains four spark plugs designed for four-stroke engines, measuring 0.5 inches in diameter and 3 inch in height. With their reliable performance and versatility, these spark plugs ensure efficient operation and longevity for your equipment.