Practice question

The TFT eductor is rated at _____ and ______.

  1. 150 psi and 100 gpm
  2. 250 psi and 150 gpm
  3. 300 psi and 100 gpm
  4. 200 psi and 125 gpm

Answer: D — 200 psi and 125 gpm

Eductor performance is defined by a venturi-driven relationship between the water supply pressure and the discharge flow. The manufacturer publishes a rating that tells you what flow to expect at a given inlet pressure, so you can size pumps and hoses correctly and maintain the proper foam or entrainment mix. For the TFT eductor, the published operating point is 200 psi of inlet water pressure delivering about 125 gpm. That pairing is what the device is designed to produce under normal use, ensuring reliable entrainment and system performance. Pressure well above or below that point changes the flow and can push the eductor outside its tested/approved range, which is why other options aren’t listed as the rated values. So, the correct rating to rely on is 200 psi with 125 gpm.

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