The Efco 0033313 Prov Lever, also identified as YF1430022B, is an authentic OEM replacement part specifically designed for a range of Efco and Oleo-Mac chainsaw models. This critical component ensures accurate and reliable control during operation, helping to maintain the original performance and safety standards of your equipment. It is compatible with Efco models including MT 3500 S, MT 350, MT 3700, MT 370, MT 4100 S, MT 410, MT 440, MT 4500, MT 4510, MT 5200, MT 520, and Oleo-Mac models such as GS 350, GS 35, GS 370, GS 37, GS 410 C, GS 410 CX, GS 410, GS 411, GS 44, GS 450, GS 451, GS 520, GS 52.