Jabsco Par-Max HD4
#8 in 4 GPM and upFull review
A heavy-duty 4 GPM, 60 psi pump with a 3-year warranty at a fair price, for boats and RVs with two fixtures.
Amazon $165.60$165.60
4 GPM60 psi11.5 A
2.8/5
A marine-grade 4 GPM pump for boats and larger RVs with several fixtures. It costs more than pumps with similar flow and pressure.
- 4 GPMFlow
- 55 psiShut-off
- 10 AMax draw
- Pressure switchControl
Check price at Amazon$236.33
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- 4 GPM at 55 psi runs two fixtures at once
- Sealed, ignition-protected switch suits engine compartments on boats
- Comes with a strainer and hose barbs
Cons
- Costs about $59 per GPM, near the top of the range
- Pentair publishes no warranty term for it
The Shurflo Aqua King II family
Every Shurflo Aqua King II model we rank, smallest first. Ratings compare each against its own flow.
| Model | Flow | Rating | Price |
|---|---|---|---|
| Shurflo Aqua King II Junior 2.0 | 2 GPM | 2.0/5 | $114.80 |
| Shurflo Aqua King II Premium 4.0 (this one) | 4 GPM | 2.8/5 | $236.33 |
| Shurflo Aqua King II Supreme 5.0 | 5 GPM | 3.1/5 | $359.09 |
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 number | 4148-153-E75 |
|---|---|
| Performance | |
| Rated open flow | 4 GPM |
| Shut-off pressure | 55 psi |
| Max current draw | 10 A |
| Price per GPM | $59.08 |
| Self-priming lift | 6 ft |
| Features | |
| Control | Pressure switch |
| Diaphragm chambers | 4 |
| Internal bypass | Yes |
| Runs dry | Yes |
| Thermal protection | Yes |
| Strainer included | Yes |
Alternatives in this flow
Shurflo Aqua King II Supreme 5.0
#9 in 4 GPM and upFull review
A high-flow marine pump that is easy on the batteries for its 5 GPM. It is the most expensive pump here.
Amazon $359.09$359.09
5 GPM55 psi7 A
Shurflo 4048 High Flow 4.0 GPM
#11 in 4 GPM and upFull review
Shurflo’s high-flow RV pump for rigs that run more than one fixture. Pumps with the same 4 GPM and higher pressure cost less.
Amazon $248.99$248.99
4 GPM55 psi10 A
Compare
Compare the Shurflo Aqua King II Premium 4.0 with any other RV water pump →
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