Hydrant Diffuser

A hydrant diffuser offers quick and efficient hydrant flow testing.  The 2½" hydrant diffusers use a dual function, liquid filled gauge, which measures both gallons per minute as well as PSI.  They also feature a 2½" female NST swivel so that when connected to the hydrant, the water flow can be aimed in a desirable direction as to not disturb landscape or damage objects in the waters path.  We have various 4½" models as well for the steamer side of a fire hydrant.

  • Rugged aluminum construction
  • Gauge face = 4" diameter
  • All parts are field replaceable
  • 2½" models weight = 7.7 lbs.
  • 4"+ models weight = 14 lbs.
  • Carrying case sold separately 
Part Number Size Configuration
DIFFUSER100 2½" F Swivel NST 100 PSI / 1680 GPM
DIFFUSER160 2½" F Swivel NST 160 PSI / 2120 GPM
DIFFUSERCASE Carrying case for 2½" hydrant diffuser Black PVC
DIFFUSERKIT 2½" F Swivel NST *See Download Spec Sheet
DIFFUSER100-4 4" F Swivel NST 100 PSI 4" gauge
DIFFUSER100-45 4½" F Swivel NST 100 PSI 4" gauge
DIFFUSER100-SZ5 5" Storz 100 PSI 4" gauge
DIFFUSERNG-4 4" F Swivel NST For flushing only, no gauge
DIFFUSERNG-45 4½" F Swivel NST For flushing only, no gauge
DIFFUSERCASEL Carrying case for 4" & 4½" hydrant diffuser Black PVC