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Wheeler-Rex 39300 hydrostatic test pump, twin piston, blue metal frame, 14 by 10 by 12 inches

Wheeler-Rex

Wheeler-Rex 39300 Hydrostatic Test Pump 4 gpm Twin Piston 3/4 in

SKU CH-XZRD-AZPBB MPN 39300

Hydrostatic test pump with twin-piston design delivering 4 gpm flow at up to 300 psi for pressure testing pipe systems

  • TypeDrain Components
  • MaterialHAWA
  • Delivers up to 4 gpm flow rate for fast system filling
  • Twin-piston design provides steady 300 psi pressure for reliable testing
  • Accepts 115/230 V AC power for flexible job-site hook-up
  • Compact 14 in length fits tight mechanical rooms
  • 3/4 in GHT intake connects directly to standard supply hose

Hydrostatic Test Pump for Pressure Testing

The Wheeler-Rex 39300 is a twin-piston hydrostatic test pump built for pressure-testing piping systems. It delivers a maximum flow rate of 4 gpm and a maximum discharge pressure of 300 psi. The unit operates on 115/230V AC power with a 1/2 hp motor running at 1,725 RPM. It is intended for plumbers and contractors who need to verify system integrity before commissioning.

Connection Limits and Operational Range

The pump accepts a 3/4 in GHT intake connection and a 3/4 in GHT intake hose. Discharge is provided through a 5/8 in FNPT connection with a 1/4 in FNPT discharge hose. Maximum discharge pressure is capped at 300 psi, which defines the upper limit for any test procedure. The twin-piston design supports steady flow within these rated boundaries.

Setup Checks Before Use

Confirm that your power supply matches the 115/230V AC nameplate voltage before connecting the motor. Verify that the 3/4 in GHT intake fittings and 5/8 in FNPT discharge port are compatible with your existing hoses and test adapters. Ensure the 12 in height, 14 in length and 10 in width footprint fits your work area or transport vehicle. Check that the system you plan to test does not require pressure beyond the 300 psi maximum.

Highlights

  • Delivers up to 4 gpm flow rate for fast system filling
  • Twin-piston design provides steady 300 psi pressure for reliable testing
  • Accepts 115/230 V AC power for flexible job-site hook-up
  • Compact 14 in length fits tight mechanical rooms
  • 3/4 in GHT intake connects directly to standard supply hose

Specifications

TypeDrain Components
MaterialHAWA
BrandWheeler-Rex
Model39300

Questions about this item

Should I pick the 4 gpm twin-piston version or a single-piston model?

The 4 gpm twin-piston design delivers steadier pressure for hydrostatic testing, while a single-piston unit would pulse more at the same flow rate.

What does the 300 psi maximum pressure mean when the pump is connected to a test line?

It is the highest discharge pressure the pump can develop; the actual test pressure will be limited by the line rating and any relief valve you install.

How do the 3/4 in GHT intake and 5/8 in FNPT discharge affect hose selection?

You need a 3/4 in garden-hose-thread supply hose and a 5/8 in female NPT discharge hose; both thread types are fixed on the pump.

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