A nozzle's orifice size is related to the gallon per minute of the pressure washer pump. However, the soap nozzle will have a 6.5 orifice because it decreases the velocity of the water and decreases the pressure in the hose, which pulls chemicals into the water stream. A 6.5 orifice will have a hole size of 1.63mm.
NorthStar 1/4in. Pressure Washer Quick-Connect Detergent Spray Nozzle, Size 6.5, Brass

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- Size 6.5 soap orifice provides effective low-pressure detergent application
- 65° spray pattern delivers wide coverage for fast even detergent distribution
- Brass quick-connect design allows fast secure attachment
- Durable construction resists corrosion and wear for long service life
- Rated for pressures up to 5,000 PSI for reliable high-pressure performance
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