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 and the Seaflo 33 Series 3.0 GPM 45 psi are evenly matched, rated 3.7 and 3.6. The Seaflo 42 Series 3.0 GPM 55 psi leads on pressure. The Seaflo 33 Series 3.0 GPM 45 psi costs $6.33 less ($52.99 vs $59.32).
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.
Seaflo 33 Series 3.0 GPM 45 psi
#2 in Under 4 GPMFull review
The cheapest way to a 3 GPM pump with a 4-year warranty. Buy it for a travel trailer when a firm 55 psi shower isn’t a priority.
Amazon $52.99$52.99
Which should you buy?
- Choose the Seaflo 42 Series 3.0 GPM 55 psi for pressure (55 psi shut-off vs 45 psi shut-off).
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 | Seaflo 33 Series 3.0 GPM 45 psi |
|---|---|---|
| Overall rating | 3.7/5 | 3.6/5 |
| Value 25% | 82 $19.77 per GPM ($59.32, 3 GPM) | 89 $17.66 per GPM ($52.99, 3 GPM) |
| Flow 20% | 25 3 GPM rated open flow | 25 3 GPM rated open flow |
| Pressure 15% | 71 55 psi shut-off | 43 45 psi shut-off |
| Efficiency 10% | 51 0.43 GPM per amp (7 A max) | 50 maximum current draw not published (neutral score used) |
| Features 15% | 40 internal bypass, runs dry without damage | 45 runs dry without damage, thermal protection, strainer included |
| Warranty 15% | 100 4-year warranty | 100 4-year warranty |
Specifications
| Seaflo 42 Series 3.0 GPM 55 psi | Seaflo 33 Series 3.0 GPM 45 psi | |
|---|---|---|
| Performance | ||
| Rated open flow | 3 GPM | 3 GPM |
| Shut-off pressure | 55 psi | 45 psi |
| Max current draw | 7 A | - |
| Price per GPM | $19.77 | $17.66 |
| Self-priming lift | 6 ft | 6 ft |
| Features | ||
| Control | Pressure switch | Pressure switch |
| Diaphragm chambers | - | 3 |
| Internal bypass | Yes | - |
| Runs dry | Yes | Yes |
| Thermal protection | - | Yes |
| Strainer included | - | Yes |
| Build | ||
| Warranty | 4 years | 4 years |