What is the orifice size of the nozzles included with my pressure washer? The orifice size for each nozzle is 1.0 mm, suitable for interchangeable use between the SPX9000, SPX4000, and SPX3000 series pressure washers. The detergent nozzle size is from 3.2-3.8 mm. Related articles Can I use an aftermarket spray nozzle with the quick connect wand? What is the orifice size of the nozzles included with my pressure washer? Can I use another brand's accessory with my Sun Joe pressure washer? Sun Joe High-Pressure Washer Hose Compatibility Guide What is the coverage area of the Aqua Joe AJ-OMS18-BRS?