RV Diaphragm Water Pump 3.3–5.5 GPM Adjustable | SucceBuy
RV Diaphragm Water Pump 3.3–5.5 GPM Adjustable | SucceBuy
SucceBuy RV Diaphragm Water Pump — Reliable On-Demand Water Flow for RV, Boat, Marine & Lawn
Keep the water flowing wherever you go! The SucceBuy adjustable diaphragm pump delivers consistent, quiet, and powerful water pressure for RVs, campers, boats, yachts, agricultural irrigation, lawn spraying, and car washing. Available in three flow-rate configurations — 3.3 GPM, 3.5 GPM, and 5.5 GPM — this versatile self-priming pump automatically starts and stops with your faucet, so you always have water on demand without wasting a drop. Made in China.
Key Features
- Automatic Pressure Switch: The pump starts when you open a faucet and shuts off the moment it's closed — no manual toggling needed. The rated pressure is fully adjustable (40–80 PSI or 40–100 PSI depending on model), so you can fine-tune flow to match your exact setup. Simply rotate the adjustment screw clockwise to increase pressure and counterclockwise to decrease it.
- High Flow Rate & Self-Priming: Choose from 3.3 GPM, 3.5 GPM, or 5.5 GPM open flow rates. The self-priming capability reaches up to 6 ft (1.8 m), making installation in tight spaces or lower reservoirs simple and hassle-free.
- Quiet, Low-Power Operation: Engineered for smooth, near-silent performance so it won't disturb sleep or conversation in an RV or cabin. Low power consumption helps keep your energy usage in check whether running on 12V DC or 110V AC (model dependent).
- Built-In Overload Protection: The motor automatically shuts down if it encounters a blockage or abnormal operating condition, protecting the pump from overheating and extending its service life.
- FCC & CE Certified: Rigorously tested for electrical safety and product quality, giving you confidence in every installation.
- Durable Construction: The housing is molded from PA6 reinforced with 30% glass fiber for impact and corrosion resistance. Santoprene diaphragms and EPDM valves handle temperatures up to 60 °C (140 °F) and granule sizes under 300 µm (50 mesh).
- Easy Connection: Two included 1/2" MNPT hose adapters let you connect to standard plumbing lines quickly. Sealing tape and a filter are included to minimize wear and protect internal components.
- Multi-Purpose Versatility: Ideal for RVs, campers, marine vessels, boats, yachts, agricultural sprayers, long-distance yard irrigation, and vehicle washing stations.
Specifications
| Models Available | NMDPA33-G33-45-110 | NMDP42-G35-55-12 | NMDP52-G55-70-12 |
| Max Flow Rate | 3.3 GPM / 3.5 GPM (13.25 L/min) / 5.5 GPM |
| Rated Voltage | 110V AC / 12V DC / 12V DC |
| Amps | 1.6A / 7.5A / 17A |
| Rated Pressure | 45 PSI (adj. 40–80 PSI) / 55 PSI (adj. 40–80 PSI) / 70 PSI (adj. 40–100 PSI) |
| Diaphragm Chambers | 3 / 4 / 5 |
| Rated Suction Height | 6 ft / 1.8 m |
| Inlet/Outlet Diameter | 1/2" MNPT (12.7 mm) |
| Diaphragm Material | Santoprene |
| Valve Material | EPDM |
| Shell Material | PA6 + 30% Glass Fiber |
| Max Liquid Temperature | 60 °C / 140 °F |
| Granule Size | < 300 µm (50 Mesh) |
| Product Weight | 5.1 lbs / 4.19 lbs / 6.17 lbs |
| Product Size (3.5 GPM model) | 212 × 124.5 × 109.75 mm (8.35" × 4.9" × 4.32") |
| Certification | CE, FCC |
| Country of Origin | Made in China |
What's in the Box
- 1 × Diaphragm Pump
- 2 × 1/2" MNPT Hose Adapters
- 1 × Inlet Filter
- 1 × Sealing Tape
- 1 × Hex Wrench
Learn More About Safe Pump & Electrical Installations
For guidance on safe electrical wiring practices when installing 12V or 110V pumps in RVs and marine vessels, visit the U.S. Consumer Product Safety Commission (CPSC) for consumer safety resources.
Frequently Asked Questions
Q: What flow rate should I choose — 3.3 GPM, 3.5 GPM, or 5.5 GPM?
A: For most RVs and small boats with 1–2 faucets or fixtures, the 3.3 GPM (110V) or 3.5 GPM (12V) model provides ample water pressure. If you have a larger vessel, multiple outlets running simultaneously, or need higher-demand irrigation, the 5.5 GPM 12V model is the better choice for sustained, high-flow performance.
Q: Can this diaphragm pump run dry without damage?
A: The pump supports short-duration dry running, which protects it during momentary air gaps in the supply line. However, extended dry running is not recommended. The built-in overload protection will shut the motor down automatically in abnormal conditions to prevent damage.
Q: Is the pressure really adjustable, and how do I change it?
A: Yes — each model ships with a preset rated pressure (45, 55, or 70 PSI) but can be adjusted within its specified range using the included hex wrench. Rotating the adjustment screw clockwise increases pressure; counterclockwise decreases it. Always adjust gradually and check connections for leaks after making changes.
Q: What size hose or plumbing fittings does this pump use?
A: All three models feature a 1/2" MNPT (male NPT) inlet and outlet. Two hose adapters are included in the box, making it straightforward to connect to standard RV, marine, or garden hose lines without purchasing additional fittings in most cases.
Q: Is this pump safe for potable (drinking) water use?
A: The pump's Santoprene diaphragms and EPDM valves are materials commonly used in water-handling applications. However, SucceBuy does not explicitly certify this pump for potable water contact, so it is best suited for non-drinking water applications such as irrigation, washing, and utility water supply unless you confirm food-grade compliance with the manufacturer.