Oil Reservoir Genuine Fisher 21830 Insta-Act Hydraulic Reservoir Kit (Straight Blade) Complete OEM Replacement Reservoir A cracked or leaking hydraulic reservoir can lead to fluid loss and pump failure. The Genuine Fisher 21830 Reservoir Kit is the official factory replacement part to fix your system. This kit is designed specifically for Fisher’s Insta-Act hydraulic units, which are common on many full-size straight blade plows. It is also the same as Western part number 21830. This kit provides everything you need to replace a damaged reservoir and ensure a perfect, factory-spec seal. Product Features & Specifications: Part Number: 21830 Brand: Fisher (Genuine OEM) Application: Hydraulic Reservoir for Insta-Act Systems Also Replaces: Western 21830 Kit Includes: (1) Hydraulic Reservoir (Tank) (1) O-Ring (Part # 66519) (1) Fill Plug (Part # 92079) (1) Drain Plug (Part # 92095) (4) Mounting Screws (Part # 66607) Compatibility: Fits: Most Fisher full-size straight blade plows with Insta-Act hydraulics. Fits: Legacy Fisher EZ-V v-plows. Does NOT Fit: Fisher Homesteader, HS, HT Series, Extreme V, XV2, or XLS plows. Always verify your plow model and hydraulic unit type before ordering to ensure correct fitment.