Peterbilt 388 Tractor & Trailer Air Valve Knobs

Your semi truck interior has never looked so good! Accent your dash with beautiful, high-quality chrome plated aluminum knobs. Features 388 engraving. Knobs will never tarnish, are scratch resistant, and easy to clean.
Choose a shape from the drop-down menu.
Sold individually.

To Install:

Before removing your plastic knobs, place the yellow and red stickers on your dashboard behind the corresponding valve.

Unscrew the plastic knobs and install the corresponding chrome knobs onto each valve.

Make sure the set screw on your chrome knob is not already engaged before starting the ignition.

Screw the button and align the logo the way you want it.

Tighten the set screw with a 3/32 Allen wrench, not included.