OEM AR 7/8" Shaft 2800 PSI PRESSURE WASHER PUMP for Craftsman 580752420, 580752800 Specs - Max Pressure: 2800 PSI. Max Flow: 2.5 GPM. Max Pump Speed: 3400 RPM. Shaft Size: 7/8". 4 Bolt Pattern. Max Fluid Temperature: 140° F. Inlet Type: 3/4" Garden Hose. Outlet Type: 22mm x 14mm. Oil Capacity: 2.2oz (prefilled). Refer to images 2 & 3 for more information Includes - (1) Vertical Pressure Washer Pump, (1) Thermal Release Valve, (1) Chemical Injector (both come installed), (4) Bolts, (4) Lock Washers; comes as shown in the first image This is a triplex residential plunger pump for vertical gas engine driven pressure washers. This pump mounts directly on to the engine shaft by using a keyed hollow shaft connection system. The mounting flange provides a convenient connection to most 7/8" diameter shaft vertical gas engines with at least 5-5.5 HP. Please note it is not recommended to run any pressure washer pump above its maximum PSI rating. Doing so can result in damage to the pump (not covered by warranty) Please confirm your OEM part number, along with your unit's model, spec, type/code, and serial number to ensure this is the correct part for your unit. This part may replace multiple OEM numbers, so verifying every detail is important for a proper fit. If you're unsure or have questions about compatibility, feel free to contact us! OEM AR 7/8" Shaft 2800 PSI PRESSURE WASHER PUMP for Craftsman 580752420, 580752800. Please review all product information to ensure that this product is compatible with your unit. Our staff constantly strives to provide clear and concise product information. We understand that sometimes it can be difficult to confirm product compatibility. It is your responsibility to confirm this is the correct product you need; therefore, we encourage all customers to fully review the information provided in this listing prior to purchase. Nothing is worse than having to return a product, trust us...we get it. Let's work together to avoid this! If you are unsure as to whether or not this is the correct product for your unit, please ask. If you seek assistance we will need as much of the following information as possible, if applicable, to help you find the product you are looking for: ▪ Model and/or Sub-model ▪ Spec and/or Type Number ▪ Code and/or Serial Number ▪ Year ▪ Engine Horsepower. Our knowledgeable product specialists are always willing to help you verify product fitment. Stay rugged, my friend.