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
3.3/5
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.
- 3 GPMFlow
- 55 psiShut-off
- Pressure switchControl
Check price at Amazon$74
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Same 3 GPM and 55 psi as the Shurflo 4008 it replaces, for less
- Internal bypass and thermal protection
- Primes up to 9 ft
Cons
- Maximum current draw is not published
- Strainer may need buying separately
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 | 4008-101-A65 12V |
|---|---|
| Performance | |
| Rated open flow | 3 GPM |
| Shut-off pressure | 55 psi |
| Price per GPM | $24.67 |
| Self-priming lift | 9 ft |
| Features | |
| Control | Pressure switch |
| Internal bypass | Yes |
| Runs dry | Yes |
| Thermal protection | Yes |
| Build | |
| Weight | 4 lb |
| Warranty | 2 years |
Alternatives in this flow
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
3 GPM45 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
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