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
The Shurflo Aqua King II Premium 4.0 and the Shurflo 4048 High Flow 4.0 GPM are evenly matched, rated 2.8 and 2.8. The Shurflo Aqua King II Premium 4.0 costs $12.66 less ($236.33 vs $248.99).
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 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
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 | Shurflo Aqua King II Premium 4.0 | Shurflo 4048 High Flow 4.0 GPM |
|---|---|---|
| Overall rating | 2.8/5 | 2.8/5 |
| Value 25% | 11 $59.08 per GPM ($236.33, 4 GPM) | 8 $62.25 per GPM ($248.99, 4 GPM) |
| Flow 20% | 50 4 GPM rated open flow | 50 4 GPM rated open flow |
| Pressure 15% | 71 55 psi shut-off | 71 55 psi shut-off |
| Efficiency 10% | 43 0.40 GPM per amp (10 A max) | 43 0.40 GPM per amp (10 A max) |
| Features 15% | 65 internal bypass, runs dry without damage, thermal protection, strainer included | 65 internal bypass, runs dry without damage, thermal protection, strainer included |
| Warranty 15% | 0 warranty not published, scored as none | 0 warranty not published, scored as none |
Specifications
| Shurflo Aqua King II Premium 4.0 | Shurflo 4048 High Flow 4.0 GPM | |
|---|---|---|
| Performance | ||
| Rated open flow | 4 GPM | 4 GPM |
| Shut-off pressure | 55 psi | 55 psi |
| Max current draw | 10 A | 10 A |
| Price per GPM | $59.08 | $62.25 |
| Self-priming lift | 6 ft | 6 ft |
| Features | ||
| Control | Pressure switch | Pressure switch |
| Diaphragm chambers | 4 | 4 |
| Internal bypass | Yes | Yes |
| Runs dry | Yes | Yes |
| Thermal protection | Yes | Yes |
| Strainer included | Yes | Yes |