Johnson Pump Aqua Jet WPS 4.0

Last updated: November 9, 2026

Johnson Pump Aqua Jet WPS 4.0
2.8/5#12 of 12 in 4 GPM and up RV water pumps
2.8

A marine pressure pump with a 3-year warranty, for boats where 41 psi is plenty. RV owners after a firmer shower should look at 55 psi pumps.

  • 4 GPMFlow
  • 41 psiShut-off
  • Pressure switchControl
Check price at Amazon$185.09

Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros
  • Limited 3-year warranty
  • 4.0 GPM covers a galley and a head on most boats
Cons
  • 41 psi shut-off is soft next to 55 psi RV pumps
  • Maximum current draw is not published

The Johnson Pump Aqua Jet WPS family

Every Johnson Pump Aqua Jet WPS model we rank, smallest first. Ratings compare each against its own flow.

ModelFlowRatingPrice
Johnson Pump Aqua Jet WPS 3.53.5 GPM2.8/5$137.49
Johnson Pump Aqua Jet WPS 4.0 (this one)4 GPM2.8/5$185.09

How it scores

The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its flow. How we rank explains each one.

Specifications

Model number10-13406-103
Performance
Rated open flow4 GPM
Shut-off pressure41 psi
Price per GPM$46.27
Features
ControlPressure switch
Build
Weight4.5 lb
Warranty3 years

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