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 2.8. The Seaflo 42 Series 3.0 GPM 55 psi leads on warranty, value and efficiency. The Seaflo 42 Series 3.0 GPM 55 psi costs $46.63 less ($59.32 vs $105.95).
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.
Lippert Flow Max 3.0 GPM 12V
#6 in Under 4 GPMFull review
A dealer-friendly 3 GPM replacement from a big RV parts maker. Seaflo’s 42 Series gives the same flow and more pressure for less.
Amazon $105.95$105.95
Which should you buy?
- Choose the Seaflo 42 Series 3.0 GPM 55 psi for warranty (4-year warranty vs 2-year warranty), value ($19.77 per GPM ($59.32, 3 GPM) vs $35.32 per GPM ($105.95, 3 GPM)) and efficiency (0.43 GPM per amp (7 A max) vs 0.32 GPM per amp (9.5 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 | Lippert Flow Max 3.0 GPM 12V |
|---|---|---|
| Overall rating | 3.7/5 | 2.8/5 |
| Value 25% | 82 $19.77 per GPM ($59.32, 3 GPM) | 44 $35.32 per GPM ($105.95, 3 GPM) |
| Flow 20% | 25 3 GPM rated open flow | 25 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) | 19 0.32 GPM per amp (9.5 A max) |
| Features 15% | 40 internal bypass, runs dry without damage | 30 runs dry without damage, strainer included |
| Warranty 15% | 100 4-year warranty | 33 2-year warranty |
Specifications
| Seaflo 42 Series 3.0 GPM 55 psi | Lippert Flow Max 3.0 GPM 12V | |
|---|---|---|
| Performance | ||
| Rated open flow | 3 GPM | 3 GPM |
| Shut-off pressure | 55 psi | 50 psi |
| Max current draw | 7 A | 9.5 A |
| Price per GPM | $19.77 | $35.32 |
| Self-priming lift | 6 ft | - |
| Features | ||
| Control | Pressure switch | Pressure switch |
| Internal bypass | Yes | - |
| Runs dry | Yes | Yes |
| Strainer included | - | Yes |
| Build | ||
| Warranty | 4 years | 2 years |