Compatibility : This chainsaw valving set fits multiple models including K650, K750, 272S, 371K, and 268/281/288 series (part numbers 2063 2165) Precisions Replacement Parts : Designed to replace OEM part numbers 503715301, 503472001, and 503665501, ensuring exacts fit and for your chainsaw Stainless Steel Construction : Made from stainless steel for enhanced resistance and long terms durability in tough cutting conditions Multiple Brand Application : Suitable for chainsaws, cutoff sawing, and stump grinders from various brands including and other major manufacturers Comprehensive Set: Includes 1 valving per package, providing essential replacement parts for maintaining optimal chainsaw