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
The Jabsco Par-Max HD4 is the better RV water pump overall, rated 3.2 to 2.8. The Jabsco Par-Max HD4 leads on value and pressure. The Shurflo Aqua King II Premium 4.0 wins on features and efficiency. The Jabsco Par-Max HD4 costs $70.73 less ($165.60 vs $236.33).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Shurflo Aqua King II Premium 4.0
#10 in 4 GPM and upFull review
A marine-grade 4 GPM pump for boats and larger RVs with several fixtures. It costs more than pumps with similar flow and pressure.
Amazon $236.33$236.33
Which should you buy?
- Choose the Jabsco Par-Max HD4 for value ($41.40 per GPM ($165.60, 4 GPM) vs $59.08 per GPM ($236.33, 4 GPM)) and pressure (60 psi shut-off vs 55 psi shut-off).
- Choose the Shurflo Aqua King II Premium 4.0 for features (internal bypass, runs dry without damage, thermal protection, strainer included vs runs dry without damage, thermal protection) and efficiency (0.40 GPM per amp (10 A max) vs 0.35 GPM per amp (11.5 A max)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 4 GPM and up RV water pump; a clear win is highlighted. How we rank explains each one.
| Factor weight | Jabsco Par-Max HD4 | Shurflo Aqua King II Premium 4.0 |
|---|---|---|
| Overall rating | 3.2/5 | 2.8/5 |
| Value 25% | 34 $41.40 per GPM ($165.60, 4 GPM) | 11 $59.08 per GPM ($236.33, 4 GPM) |
| Flow 20% | 50 4 GPM rated open flow | 50 4 GPM rated open flow |
| Pressure 15% | 86 60 psi shut-off | 71 55 psi shut-off |
| Efficiency 10% | 28 0.35 GPM per amp (11.5 A max) | 43 0.40 GPM per amp (10 A max) |
| Features 15% | 35 runs dry without damage, thermal protection | 65 internal bypass, runs dry without damage, thermal protection, strainer included |
| Warranty 15% | 67 3-year warranty | 0 warranty not published, scored as none |
Specifications
| Jabsco Par-Max HD4 | Shurflo Aqua King II Premium 4.0 | |
|---|---|---|
| Performance | ||
| Rated open flow | 4 GPM | 4 GPM |
| Shut-off pressure | 60 psi | 55 psi |
| Max current draw | 11.5 A | 10 A |
| Price per GPM | $41.40 | $59.08 |
| Self-priming lift | 8 ft | 6 ft |
| Features | ||
| Control | Pressure switch | Pressure switch |
| Diaphragm chambers | 4 | 4 |
| Internal bypass | - | Yes |
| Runs dry | Yes | Yes |
| Thermal protection | Yes | Yes |
| Strainer included | - | Yes |
| Build | ||
| Weight | 5.6 lb | - |
| Warranty | 3 years | - |