Replace Part Number: FS1029W, P176160, P176161, P550463, PF7548, PF7620, PF7621, PF7680, FS19536, FS19536W, FS19558, FS1005, FS1016, FF5278, FF5315. Bypass valve design: When the filter in the filter is blocked due to excessive impurities, the bypass valve will open, and the lubricating oil will directly enter the engine for lubrication without passing through the filter.