MOST ENGINES BETWEEN 4HP AND 7HP HAVE THAT SIZE SHAFT. THOSE UNITS ARE STILL SHOWING HIGH LISTS PRICES FOR REPLACEMENT PUMPS FOR INSTANCE THE D29105 SJV MODELS LISTS FOR 436.00. THE EXCEPTION TO THE 3/4" SHAFT IS THE HONDA BY EXCELL DELTA AND DEVILBISS THEY HAD HONDA BUILD AN ENGINE WITH A 7/8" HORIZONTAL SHAFT. ESPECIALLY IF YOUR ENGINE HOSES AND GUN/WAND ARE STILL IN GOOD CONDITION. I WILL GLADLY HELP YOU WITH APPLICATION ISSUES CALL.This item is in the category "Business & Industrial\Cleaning & Janitorial Supplies\Pressure Washers, Parts & Accessories\Pressure Washer Parts & Accessories\Other Pressure Washer Parts & Accessories". The seller is "apvvdistributing" and is located in this country: US. This item can be shipped to United States.