Sonic Foam System - Hex Ball Grip Key Set - 7 Pieces - 1/3 (Small) Subtype - Compressed Air Accessories Outlet = 3/8" Female Coupler:

Outlet = 3/8" Female Coupler:  This 3/8" coupler would receive a 3/8" plug

but they also serve a functional purpose - keeping the dribble from your pressure washer hose from dribbling

you probably want to skip this

It also won't do well if you are really hard on your windshield

Sonic Foam System - Hex Ball Grip Key Set - 7 Pieces - 1/3 (Small) Subtype - Compressed Air Accessories Outlet = 3/8" Female Coupler:These are the tools I've decided to use at OGHQ, they have a nice quality to them with good ergonomics. They aren't intended to replace everything but there is a great variety of tools offered here. For the price, you cannot beat them vs something that's 2x or 3x the cost like Snap On.