Sonic Foam System - Combo Set 1/4", 3/8", 1/2" - 156 Pieces - 34" (Large) and Brushes A minimum pressure of 30

A minimum pressure of 30 PSI is required to permit this valve to function properly

It will stain it

Make sure you leave enough room between the wall and the unloader valve (red knob) to operate

It's ready to wipe off by the time you make it back to the windshield

This coupler is only compatible with the Chrome Plated Prevost 3/4" plug

Sonic Foam System - Combo Set 1/4", 3/8", 1/2" - 156 Pieces - 34" (Large) and Brushes A minimum pressure of 30These 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.