What is the purpose of this hose valve on my well pump? It is standard garden hose shutoff valve. I do have a pressure vessel that sits on top of the pump that feeds my irrigation system as well as an outside hose bib.

     |    Pipe 1 (centered on pump)
Jet  |--------------------------------- To well
Pump |
     |---------------------------|----- To well
     |    Pipe 2                 | 
------                          Hose
  • 1
    It's probably either for priming the pump (input) or for seasonal or maintenance draining (output).
    – isherwood
    Jul 14, 2017 at 14:18
  • Do both lines draw water from the well or does one act as a return line?
    – Freiheit
    Jul 14, 2017 at 14:22

1 Answer 1


You mention that it's a jet pump - so the valve is probably for priming the jet. The centered pipe is suction, the off-center pipe is the jet feed.

In my opinion, jet pumps are well on their way to being a holdover from times past, when electric motor reliability was questionable, and submersible electric motor reliability doubly so - they trade complexity and inefficiency of operation to keep the motor out of the well - a portion of water is pumped down to the jet, to help bring up more water from a depth where straight suction won't work. As such, when starting one up, you need to put water into the jet pipe (without having a working pump...complex, not fun.)

With current technology, when time comes to replace a jet pump you will almost always save considerably on operational costs by changing to a 2-wire deep well submersible pump with a single output pipe. However, it's generally not worth doing that if your jet pump is working well at present.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.