Our awesome friend Kevin makes these for us. These are custom made hose plugs for when your pressure washer hose is not in use. Hoses will usually have water left over inside after use & will drain out all over you and the floor (especially if you have a hose reel). This goes into the end of your coupler and keeps you and your garage from getting wet. Make sure to disconnect this from the coupler before pressurizing your system or you will have a rough time getting this off.
These are made of 304 stainless steel and are CNC machined and laser etched.