Remco Aquajet RV Variable Speed
#5 in 4 GPM and upFull review
A variable-speed, high-pressure pump for motorhomes with filtration or long runs. The Seaflo 56A does the same job for less.
Amazon $226.10$226.10
5 GPM75 psi
3.3/5
A low-cost 4 GPM pump for a trailer owner who wants more flow than the stock pump. Its sibling 5 GPM model costs only a few dollars more.
- 4 GPMFlow
- 45 psiShut-off
- Pressure switchControl
Check price at Amazon$59.99
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- 4 GPM for about $15 per GPM
- Strainer and hose adaptors in the box
Cons
- 45 psi shut-off is softer than 55 psi pumps
- Maximum current draw is not published
- No warranty term in the listing
The Wassermann WDP family
Every Wassermann WDP model we rank, smallest first. Ratings compare each against its own flow.
| Model | Flow | Rating | Price |
|---|---|---|---|
| Wassermann 3WDP4 4.0 GPM 45 psi (this one) | 4 GPM | 3.3/5 | $59.99 |
| Wassermann 4WDP5 5.0 GPM 55 psi | 5 GPM | 3.6/5 | $63.16 |
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 | 3WDP4-45-12V |
|---|---|
| Performance | |
| Rated open flow | 4 GPM |
| Shut-off pressure | 45 psi |
| Price per GPM | $15 |
| Features | |
| Control | Pressure switch |
| Runs dry | Yes |
| Strainer included | Yes |
Alternatives in this flow
Jabsco Par-Max HD5
#6 in 4 GPM and upFull review
A heavy-duty 5 GPM, 60 psi pump for larger boats and motorhomes. Seaflo’s 55 Series gives more flow for half the price.
Amazon $228.83$228.83
5 GPM60 psi13 A
Jabsco Par-Max HD4
#8 in 4 GPM and upFull review
A heavy-duty 4 GPM, 60 psi pump with a 3-year warranty at a fair price, for boats and RVs with two fixtures.
Amazon $165.60$165.60
4 GPM60 psi11.5 A
Compare
Compare the Wassermann 3WDP4 4.0 GPM 45 psi with any other RV water pump →
More from Wassermann: every Wassermann product ranked.