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BigBoy Hose Monster™

SKU: BP018


Ships Directly From the Manufacturer


Ships via Standard Ground

Typically ships in 1-2 Days

The BigBoy Hose Monster™ is used for fire flow testing of hydrants, water main flushing, and fire pump testing from connections 4" or larger. The BigBoy Hose Monster incorporates the patented FM approved Pitotless Nozzle™ so rocks and flushing debris pass through without causing pitot damage and accurately measures water flow-rates from 750 to 2,700 GPM. The BigBoy Hose Monster body is made from Polypropylene and the Pitotless Nozzle is made from precision machined aluminum.
Hose Monster Company

Hose Monster Company

View more by Hose Monster Company

The Hose Monster Company is committed to providing the best products in the world for testing fire pumps and fire hydrants. We are focused on providing solutions that help save lives and property by verifying fire protection systems perform when a fire occurs.

BigBoy Hose Monster™
BigBoy Hose Monster™

The BigBoy Hose Monster is intended to be used with a hose and should not be attached directly to a hydrant. The unit comes standard with a 4" NH connection and can be flowed from a larger sized connection by use reducing hose or adapters. Your hose choice will depend on: 1) the diameter of the water source connection, 2) the thread or connection type, and 3) the hose length.

Taking Flow Readings

The BigBoy GPM Gauge is calibrated to read flow-rate directly from the gauge face. No conversion chart is necessary. If you use another pressure gauge instead of the BigBoy GPM Gauge the BigBoy Hose Monster flow chart must be used to convert from psi to GPM. A 0-60 psi gauge is the most suitable range.


  • Perfect for Hydrant Flow Testing or Water Main Flushing
  • Uses the patented FM Approved Pitotless Nozzle™ so you’ll never have to change out a pitot because it got hit by a rock.
  • Read your GPM flow-rate directly on the gauge face while flowing
  • Weighs only 13 lbs. yet handles high flow hydrants up to 2,700 GPM
  • 4" NH standard connection size, other thread specs are available.
  • Flow from 4.5", or 5" STORZ connections with additional accessories


  • Big Boy Hose Monster Body: Made from glass-filled Polypropylene
  • Big Boy Pitotless Nozzle 4": Measures 750 to 2,700 GPM; Factory-installed
  • Big Boy GPM Gauge: Reads both GPM flow-rate and psi; 4" dial; liquid-filled

Product Brochure

BigBoy Hose Monster™ User Guide

BigBoy Hose Monster™ Flow Chart