Shear Valves

for DEF/AdBlue®

FLEX-ING™ brand 1½” diesel exhaust fluid shear valves shut off the flow of DEF/AdBlue® in the event of a vehicle collision with a dispenser preventing an excessive and uncontrolled release into the environment. The optional e-coated mounting bracket allows installation both in containment sumps beneath the dispenser as well as direct mounting to the concrete forecourt.



  • Integrated wrench flats for easy installation.
  • Mounting bracket kit allows for in-sump containment or flush mounting.
  • Available with either 1½” NPT or BSPT inlet (bottom) and 1″ NPT or BSPT outlet (top) options.


  • Body: Stainless steel
  • Mounting bracket: E-coated steel
  • Height: 3¾” (95.25 mm)
  • Break force: Under 650 pound-feet (884 N-m)
  • Break force within parameters established by UL842 for product shear valves.
  • Must be installed with locally supplied 1″ rigid pipe threaded into outlet.

Order Info

Model Description
663100001 DEF shear valve, 1½” NPT inlet, 1″ outlet
663100021 DEF shear valve, 1½” BSPT inlet, 1″ outlet
66320000 Mounting bracket for DEF shear valve including U-bolt, nuts and bracket guides