Our pressure washer spray lance was jammed. It took a lot of force to remove it. The reason was dirt in the connection.
So I created this cap to prevent such a problem in the future.
You need an O-ring with an ID of 20x3.55mm. I got mine from a Parkside O-ring kit.
I printed it with the opening facing up and the supports activated everywhere.
The author marked this model as their own original creation.