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SEAFLO

SEAFLO 33 Series 110V/115V AC Fresh Water Pump, 3.3 GPM 45 PSI Self-Priming Pressure Pump with Smart Pressure Switch, Automatic Demand Pump for RV, Caravan Marine Boat Industrial Use, 4-Year Warranty

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Arrives Saturday, Sep 5
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Style: 3.3 GPM | 115V


Features

  • [ SPECIFICATIONS ]: Model: SFDPA1-033-045-33 | Voltage: 115V | Flow Rate: 3.3 GPM (12.5 LPM) | Shut-Off Pressure: 45 PSI (3.1 BAR) | Max Draw: 1.0A | Self-Priming Lift: 6 ft | Ports: 1/2"-14 MNPT | Max Temperature: 140F (60C) | Diaphragm: Santoprene | Valves: EPDM | Certifications: NSF/ANSI/CAN 61 & 372, NSF 24, UL 778, | 4-Year Warranty
  • [ BACKED BY A 4-YEAR WARRANTY ]: Covered by SEAFLOs 4-Year Limited Warranty, this pump is built for long-term reliability and peace of mind. Designed for tough freshwater demands, its the perfect choice for RVs, boats, cabins, and off-grid living where consistent performance is critical.
  • [BUILT TO NSF UL Standards FOR RV POTABLE WATER ]: Built to NSF/ANSI/CAN 61 & 372 (Potable Water Safety), NSF 24 (RV Plumbing), and UL 778 (Motor-Operated Water Pumps) Safe for drinking water and compliant with RV and marine plumbing standards across North America.
  • [ INCLUDED COMPONENTS ]: Includes the SEAFLO 33-Series Pump, 50 Mesh Inlet Strainer, (2) 1/2" Barbed Hose Fittings, Wall Plug for 115V AC Power, Mounting Hardware, and User Manual for a complete plug-and-play setup. Perfect for DIY installs in RVs, marine applications, cabins, and household systems with minimal tools required.
  • [ SELF-PRIMING AND RUN DRY CAPABLE ]: Self-primes up to 6 feet and can run dry without damage, giving you flexibility to install above water tanks and assurance during fluctuating tank levels. The run-dry safety prevents internal wear, making this pump ideal for rugged and remote system conditions.
  • [ AUTOMATIC ADJUSTABLE PRESSURE SWITCH ]: Features a smart pressure switch that activates on water demand and stops when not needed. The adjustable PSI range (1760 PSI) lets you fine-tune performance for RVs, boats, and cabins. Enjoy hands-free operation for sinks, showers, toilets, and more.
  • [ ULTRA QUIET WITH VIBRATION DAMPENING ]: Built with a rubber mounting base that isolates vibration and sound, this pump operates at a noise level similar to a standard fan. It's the best choice for low-noise zones like boat cabins, RV sleeping quarters, or off-grid homes where silence is golden
  • [ EASY WALL PLUG-IN FOR INSTANT USE ]: Pre-installed with a standard 115V wall plug, the SEAFLO 33-Series is easy to install with no wiring experience needed. Just plug it into a power outlet and connect the plumbing. Ideal for cabins, small homes, boats, or RVs without onboard 12V DC systems.
  • [ #1 TRUSTED OEM PUMP BRAND BY THE RV INDUSTRY ]: SEAFLO is the top OEM pump brand in the U.S. RV and marine industry, used by manufacturers like Forest River, Thor, Winnebago, Grand Design, Brinkley RV, and Rev Group. The 33-Series is factory-installed and trusted for long-term performance.

Description

the SEAFLO 115V 33-Series Diaphragm Pressure Pump delivers reliable 3.3 GPM flow and 45 PSI shut-off pressure for RV, marine, household, freshwater, and saltwater systems. Built with a durable 3-chamber diaphragm, Santoprene, and EPDM components for steady performance. Built for reliable 115V AC performance, the SEAFLO 33 Series delivers 3.3 GPM open flow, 45 PSI pressure, and 6 ft vertical self-priming for RV, marine, and off-grid freshwater applications. Built for dependable performance across a wide range of uses, the SEAFLO 33 Series supports freshwater systems, washdown setups, shower sump applications, irrigation, rain collection, and general liquid transfer. Whether on the water, on the road, or off the grid, it delivers reliable flow! Self-priming up to 6 ft, run-dry capable, and built for quiet operation. An automatic adjustable pressure switch delivers on-demand water flow from 17–60 PSI, while vibration-dampening mounts help reduce noise for RVs, boats, cabins, and off-grid systems. 33 series 115V 33 series 12V 33W Series Brushless 55 Series 115V 55 Series 12V 21 Series- 12V 42 series 115V Built to applicable North American standards for RV plumbing, Pre-installed with a standard 115V wall plug, the SEAFLO 33-Series is easy to install with no wiring experience needed. Just plug it into a power outlet and connect the plumbing SEAFLO is the top OEM pump brand in the U.S. RV and marine industry, used by manufacturers like Forest River, Thor, Winnebago, Grand Design, Brinkley RV, and Rev Group. The 33-Series is factory-installed and trusted for long-term performance. SEAFLO delivers reliable marine, RV & outdoor products—thoughtfully designed, quality tested, and backed by a 4-year policy. SEAFLO provides dependable marine, RV, and outdoor products built for life on the water, on the road, and off-grid. From pumps and toilets to ventilation, electrical accessories, and essential parts, our products help customers upgrade with confidence. As a family-owned brand, every product is thoughtfully designed, quality tested, backed by 4-year coverage, and supported by our U.S.-based team.

Brand: SEAFLO


Color: Black, White


Material: Acrylonitrile Butadiene Styrene (ABS)


Style: 3.3 GPM | 115V


Product Dimensions: 7.98"L x 5.11"W x 4.84"H


Power Source: Standard 115V AC Household Plug


Item Weight: 4.2 pounds


Maximum Flow Rate: 3.3 gpm


Maximum Lifting Height: 6 feet


Voltage: 115 volts


Brand Name: SEAFLO


Model Number: SFDPA1-033-045-33


Global Trade Identification Number: 11, 97


Manufacturer: SEAFLO


Number of Items: 1


UPC: 793945652211 793945654697 647336948127


Unit Count: 1 Count


Specific Uses For Product: Marine, RV, Household Water Systems


Included Components: Water Pressure Pump, intake strainer, fittings


Manufacturer Part Number: SFDPA1-033-045-33


Power Source: Standard 115V AC Household Plug


Flow Rate: 3.3 gpm


Maximum Lifting Height: 6 feet


Voltage: 115 volts


Color: Black, White


Product Style: 3.3 GPM | 115V


Item Dimensions L x W x H: 7.98"L x 5.11"W x 4.84"H


Item Weight: 4.2 pounds


Material Type: Acrylonitrile Butadiene Styrene (ABS)


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Sep 5

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • The build quality feels durable
Style: 3.3 GPM | 115V
I am very pleased with this water pump. It was easy to install, operates quietly, and provides strong, consistent water pressure. The build quality feels durable, and it has been working reliably since installation. Whether for household use, irrigation, or transferring water, it performs exactly as expected. It offers excellent value for the price, and I would definitely recommend it to anyone looking for a dependable water pump. ... show more
Reviewed in the United States on July 18, 2026 by Nashandra McNeil
    • It works
Style: 3.3 GPM | 115V
Great product
Reviewed in the United States on August 20, 2026 by Esteban Sauceda Jr
    • Using as a camp shower pump
Style: 3.3 GPM | 115V
I am not a plumber, but consider myself pretty handy. This is the 4th and final pump I got from Amazon as part of the camp shower build process (NOT defective, just trying different options). Here's what I learned, hopefully this will be helpful to others who are building outdoor camping showers. 1. The pumps plastic male fittings don't match box store brass fittings. They likely won't leak in plastic-on-plastic installations, but if you're screwing a metal female fitting onto the pump's plastic male fittings, they won't fit and will leak, even though technically both will say 1/2". I used flexible 1/2" hose and some hose clamps to make it work and avoid brass to plastic fittings. 2. This is an on-demand pump. You plug it in, and it will sense if water is being requested anywhere in your system and start pumping. Plan to build a system that's as leak-free as possible or this pump will continue to cycle periodically. I built a prototype garden hose system, which was full of leaks, and this pump kicked on for a second every 15-20 seconds because it assumed I was requesting water (even though it was just leaks). If your system is leak-free, the pump will stay off and silent until you open a valve somewhere in the system. 3. I bit the bullet and bought the $70 PEX crimp tool, which greatly simplified building my shower system. You'll need the crimp tool, some metal ring clamps, and a few baggies of elbows, tees, splicers, and shut-off valves. I was able to build my system with zero leaks. If you're doing this, get white PEX 1/2" line, it can be used for hot/cold/any water, in other words, blue cold line, red hot line, and white neutral line are all identical and differ only cosmetically. Don't think you need to buy red line to run hot water, there's nothing inherently special about color lines - they are all the same, and the only reason they are colored is to tell them apart. 4. The pump is not silent and will vibrate, which means you'll need to attach it to some kind of a solid substrate very firmly. Mine is outside and the noise is not a problem, but if you're doing an RV/interior build, you'll definitely hear it kick on and work, especially if it's bolted to a hollow surface, like under the stairs. Find a way to bolt it to a cinder block or an anvil to dampen the vibration. 5. My system includes a shower and a sink for washing hands (same line, split via a T connector), and this pump is pretty amazing at supplying strong pressure across 10-15 yards through 1/2" PEX lines. You'll be able to take on-demand showers with serious pressure. My wife is still freaking out about the awesomeness of taking pressurized showers in the middle of nowhere. Apparently, gravity/solar showers are huge bummers with ladies who wish to wash their hair, who knew. Overall, if you also grab some flexible reinforced tubing with clamps to bypass brass-to-plastic size fitting size issue, you'll be able to build whatever you need. Strongly recommend. ... show more
Reviewed in the United States on July 17, 2019 by M. Y
    • seems to work well
Style: 3.3 GPM | 115V
first one received was a returned pump with none of the accessories, even had pipe tape on threads. amazon corrected this and shipped a new one as soon as possible. i use it to pump water from my stock tank pool to the heater and back into the pool. I've used it 3 times so far for 3-4 hrs. a time to heat the pool and so far no issues. The heater is about 3 feet above the pump and it does self prime and has good water pressure. the motor housing does get pretty warm to slightly hot but it is an encased motor so i guess i would expect it. reason for 4 star is because of the 1st pump. ... show more
Reviewed in the United States on October 24, 2025 by walter
    • great pump just make sure you purchase the hose fittings for trailer applications
Style: 3.3 GPM | 115V
( this is not a negative review just information) I received the seaflo 33 pump and was able to use it last week , to my surprise opening the package 70 miles from any hardware store, not sure if it is my fault or the sales verbiage but the pump does not come with hose attachments it actually comes with barbed fittings to only accept 1/2'' hose more for a boat bilge pump application . i am pretty handy so i was able to cut up some hose to make connections to get by and will get correct fittings when i am in town but this is just a fyi to others. NOW FOR THE GOOD STUFF THIS IS A AMAZING PUMP! it did a great job pumping down the 70 gallons of fresh water into my fifth wheel trailer , it self primed and away it went in around 15 mins i was done. if it would have come with normal hose connections so that i didn't have to reduce hoses i bet it would have done it in 10 mins. ... show more
Reviewed in the United States on July 6, 2026 by Amazon Customer
    • LOUD!
Style: 3.3 GPM | 115V
It works just fine - with one exception - it's VERY LOUD! I even put some sound insulation around it. It comes on half a dozen times per day, for 16 seconds each time; so heat shouldn't be a problem. I'll keep trying to find a work around, but I may have to junk it, and take a chance on a different pump. UPDATE 11-9-25 - - WORSE THAN WORTHLESS! After less than two months the pump would no longer turn off automatically. I contacted the seller, who kindly shipped me a pressure switch, plus a spare one. And so I do not like leaving a poor review, especially when after changing the pressure switch, the pump resumed auto operation (with the same dismal results, as I shall explain) but in the interest of a useful review system, I must. Changing the pressure switch is just two screws and two wires, but it also means – again – having to drain the pipes, and somehow absorb the water that still comes out of the pump. WORSE THAN WORTHLESS! Because I did an awful lot of work for the pump – and for what! The pump is for a tankless toilet. First of all, I built a shelf for the pump suspended with 2x4s from the joists in the basement. But because the pump was VERY loud, I changed the shelf suspensions from 2x4s to fabric-like straps. Then I removed the screws holding the pump to the shelf, placed the pump on foam, and used straps to immobilize the pump. Then I added sound insulation in the area above and nearby the pump. After all this the pump was not as loud as before from upstairs, but still way too loud. While waiting to repair the pump, I plugged the pump onto a wireless RF AC switch, to be able to turn the pump on and off from upstairs, as needed. But because flushing with or without the pump seemed the same, I installed a pressure gauge between the pump and the toilet. When flushing started, the water pressure (per the pressure gauge – which I could monitor with a camera) dropped in half, from an average of some 40 PSI to 20. Turning the pump on, added only TWO PSI to the pressure – if that! Furthermore, if I didn’t turn the pump off before the flushing stopped, when the toiled snapped shut, the pressure jumped to over 100 PSI, and although I would turn the pump off immediately after flushing stopped, the pressure would take a long time to dissipate, so that after one minute, it would still be over 90 PSI. Concerned that the high pressure may damage the toilet’s seals, I installed a bypass pipe, from before to after the pump, which worked better than I expected. With the bypass pipe, the pressure after the flushing ended, and with the pump still on, would rise by some 5 PSI, and within less than a second, it would fall in line with the pressure in the rest of the house plumbing. As before, the pump continued to add two PSI (if that) to the flushing pressure. Now you understand “an awful lot of work”, and why (considering all the work) the pump is worse than worthless. ... show more
Reviewed in the United States on October 21, 2025 by amateur3
    • Great for use as a wash-down pump in a CNC machine
Style: 3.3 GPM | 115V
Review Image by ZFMax
For many years, I've been tapping off my CNC machine's coolant sump pump for the wash-down hose. Anyone who has a CNC machine knows what I'm talking about. But sump pumps are really not designed for lots of pressure, and the wash-down has always been lacking in that department. On a whim, I picked up one of these pumps to give it a try. First thing I ran into was what others have mentioned, a 1/2 pipe thread fitting doesn't really screw onto the plastic fitting threads on the pump body. It goes on about one turn is all, if even that much. The thread pitch of the plastic is actually the same as 1/2 pipe thread, but it's not tapered. However, using a 1/2 pipe thread tap and some elbow grease, I was able to open up the inside of the 1/2 fip x 3/4 male hose end brass fitting (an off-the-shelf piece at Home Depot, SKU 894907). Wrapped some teflon tape onto the plastic and I was able to screw it about halfway on. Works good and doesn't leak. I'll include a picture. On the inlet side, I attached the included filter and then the included plastic 1/2 hose barb fitting, then a short piece of clear vinyl tubing to the sump. It only has to lift the coolant a few inches. Plugged it into the machine's "Coolant 2" plug, powered the machine on, turned on the coolant 2 function, squeezed the sprayer's trigger, and voila, great pressure! Not quite pressure washer level, but plenty to blast chips out of the far corners of the machine. Very impressed with the both the pressure and volume delivery, it's a massive improvement over the sump pump. The pump is very quiet, and kicks on as soon as I pull the trigger on the sprayer, and shuts off as soon as I release it. Really a slick little pump that solved my problem nicely. I can't believe I've gone all these years putting up with low pressure, when the solution was so simple and inexpensive. The life of the pump is still an open issue, but it has a 4 year warranty. If I get that out of it, I'll have my money's worth. If it dies before then, I'll update the review. But as of right now, five stars for this little pump. ... show more
Reviewed in the United States on February 20, 2020 by ZFMax
    • Works like a Champ.
Style: 3.3 GPM | 115V
Does what it is supposed to do and continues to do it. Increases water storage tank pressures to house pressures. Perfect for priming smaller volume electric pressure washers. Perfect for watering from a storage tank.
Reviewed in the United States on July 15, 2026 by marc

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