What is the orifice size of the nozzles included with my pressure washer? The orfice 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 another brand's accessory with my Sun Joe pressure washer? What is the orifice size of the nozzles included with my pressure washer? Can I use an aftermarket spray nozzle with the quick connect wand? Sun Joe High-Pressure Washer Hose Compatibility Guide How do I remove my pressure washer nozzle tip from my wand?