Seaflo 42 Series 3.0 GPM 55 psi
#1 in Under 4 GPMFull review
A strong-value 3 GPM replacement: 55 psi, a bypass and a 4-year warranty for about half the price of the name-brand equivalent.
Amazon $59.32$59.32
The Seaflo 42 Series 3.0 GPM 55 psi is the better RV water pump overall, rated 3.7 to 2.5. The Seaflo 42 Series 3.0 GPM 55 psi leads on value, flow and pressure. The Shurflo Revolution 4028 2.3 GPM wins on features and efficiency. The Seaflo 42 Series 3.0 GPM 55 psi costs $60.78 less ($59.32 vs $120.10).
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 Revolution 4028 2.3 GPM
#9 in Under 4 GPMFull review
A low-draw 2.3 GPM pump for a small camper or van with one fixture in use at a time. Larger rigs get more water per dollar from a 3 GPM pump.
Amazon $120.10$120.10
Which should you buy?
- Choose the Seaflo 42 Series 3.0 GPM 55 psi for value ($19.77 per GPM ($59.32, 3 GPM) vs $52.22 per GPM ($120.10, 2.3 GPM)), flow (3 GPM rated open flow vs 2.3 GPM rated open flow) and pressure (55 psi shut-off vs 50 psi shut-off).
- Choose the Shurflo Revolution 4028 2.3 GPM for features (internal bypass, runs dry without damage, thermal protection vs internal bypass, runs dry without damage) and efficiency (0.46 GPM per amp (5 A max) vs 0.43 GPM per amp (7 A max)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every under 4 GPM RV water pump; a clear win is highlighted. How we rank explains each one.
| Factor weight | Seaflo 42 Series 3.0 GPM 55 psi | Shurflo Revolution 4028 2.3 GPM |
|---|---|---|
| Overall rating | 3.7/5 | 2.5/5 |
| Value 25% | 82 $19.77 per GPM ($59.32, 3 GPM) | 19 $52.22 per GPM ($120.10, 2.3 GPM) |
| Flow 20% | 25 3 GPM rated open flow | 7 2.3 GPM rated open flow |
| Pressure 15% | 71 55 psi shut-off | 57 50 psi shut-off |
| Efficiency 10% | 51 0.43 GPM per amp (7 A max) | 60 0.46 GPM per amp (5 A max) |
| Features 15% | 40 internal bypass, runs dry without damage | 55 internal bypass, runs dry without damage, thermal protection |
| Warranty 15% | 100 4-year warranty | 0 warranty not published, scored as none |
Specifications
| Seaflo 42 Series 3.0 GPM 55 psi | Shurflo Revolution 4028 2.3 GPM | |
|---|---|---|
| Performance | ||
| Rated open flow | 3 GPM | 2.3 GPM |
| Shut-off pressure | 55 psi | 50 psi |
| Max current draw | 7 A | 5 A |
| Price per GPM | $19.77 | $52.22 |
| Self-priming lift | 6 ft | 6 ft |
| Features | ||
| Control | Pressure switch | Pressure switch |
| Diaphragm chambers | - | 4 |
| Internal bypass | Yes | Yes |
| Runs dry | Yes | Yes |
| Thermal protection | - | Yes |
| Build | ||
| Warranty | 4 years | - |