Pressure Washer Quick Coupler, Female Half, 3/8 Inch Coupling, 3/8-18 Female NPT

Brass is a solid choice for this kind of application. It handles high-pressure environments well and resists the corrosion that tends to shorten the life of cheaper couplers. Running at or near 4000 PSI is well within what this coupler is rated for, so regular commercial use shouldn't wear it down unusually fast compared to what you'd expect from a quality brass fitting.

For replacements, the key identifiers are the connection type and thread. This is the female half quick coupler socket with a 3/8 inch coupling size and 3/8-18 female NPT threading.

Rated to handle up to 4000 PSI, this brass coupler is built for the demands of professional pressure washing.