Magnum Series Pump by Nilfisk. There is a vented oil cap that should be installed. A set of bolts comes with this pump as well. It does not include a keyway. You can re-use the one from your original pump.
This pump is designed to mount to a direct drive gas engine with a 1 shaft. Please check your current pump orientation & size. The item "Magnum M2-1313G8 4000 PSI 1 Shaft Pressure Washer Pump with Unloader" is in sale since Friday, September 6, 2019. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Outdoor Power Equipment\Pressure Washers".
The seller is "northgaairless" and is located in Gainesville, Georgia. This item can be shipped to United States.