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
3 GPM55 psi7 A
3.6/5
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.
- 3 GPMFlow
- 45 psiShut-off
- Pressure switchControl
Check price at Amazon$52.99
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- The lowest price per GPM in the ranking
- 4-year warranty, the longest here
- Strainer and fittings in the box
Cons
- 45 psi shut-off is softer than the 55 psi pumps
- No bypass, so it cycles more at a trickling tap
- Maximum current draw is not published
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its flow. How we rank explains each one.
Specifications
| Model number | SFDP1-030-045-33 |
|---|---|
| Performance | |
| Rated open flow | 3 GPM |
| Shut-off pressure | 45 psi |
| Price per GPM | $17.66 |
| Self-priming lift | 6 ft |
| Features | |
| Control | Pressure switch |
| Diaphragm chambers | 3 |
| Runs dry | Yes |
| Thermal protection | Yes |
| Strainer included | Yes |
| Build | |
| Warranty | 4 years |
Alternatives in this flow
PowerMax 3.0 GPM 55 psi RV Pump
#3 in Under 4 GPMFull review
A cheaper stand-in for the Shurflo 4008 with the same flow, pressure and bypass. Seaflo’s 42 Series is cheaper still with a longer warranty.
Amazon $74$74
3 GPM55 psi
Flojet Triplex R3526144D 2.9 GPM
#4 in Under 4 GPMFull review
A long-running OEM triplex pump for trailers and campers. It costs more than importer pumps with a longer warranty.
Amazon $103.59$103.59
2.9 GPM50 psi
Compare
Compare the Seaflo 33 Series 3.0 GPM 45 psi with any other RV water pump →
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