Lightweight 7/8” Shaft Pressure Washer Pump – Pre-Filled for Lifetime Use by | Jul 26, 2026Experience superior cleaning power with our pre-filled, heavy-duty,7/8″ Shaft Pressure Washer Pump, specifically designed for vertical axial gasoline engines ranging from4 to 7 HP. Lightweight 7/8″ Shaft Pressure Washer Pump.