AFTERMARKET QUICK RELEASE VALVE / LIMITING VALVE  FOR M939 TRUCKS THAT HAVE ABS BRAKES. THIS LQ-2 VALVE MAY LOOK SLIGHTLY DIFFERENT THAN WHAT IS ON YOUR TRUCK BUT WILL MOUNT AND FIT MOST LINES. ONE PORT FOR THE EXHAUST IS NOT THREADED. 

PART # WCDFAPL-100 NSN 2530-01-515-6392, 2530015156392