This coupler is designed to adapt a 22mm fitting to 3/8" quick connect. The nipple size that will work with this coupler is 3/8". They are available in a number of configurations. See links below for more details.
NorthStar Ball-Type Pressure Washer Quick Coupler, M22 x 3/8in., 4500 PSI, Brass

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- M22-M inlet x 3/8in. QC-F coupler
- Rated for pressure washers up to 4,500 PSI
- Handles water temperatures up to 200°F
- Ball-type quick-connect design allows fast nozzle changes
- Brass construction resists corrosion and wear
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