? Professional 3600 PSI 4.9 GPM Pressure Washer Pump – Heavy-Duty Belt Drive Replacement for General Pump TS/AR/RK Series ✔ Direct Replacement for General Pump TS, AR, RK Series ✔ 24mm Solid Shaft – Fits Most Belt Drive Systems (May Require Rail Modification) ✔ Unloader Valve Included + Compatible with External Bypass Systems ✔ Premium Components for Maximum Durability & Performance ? WHY CHOOSE THIS PUMP .