--- product_id: 26770777 title: "SEAFLO 21-Series Water Pressure Diaphragm Pump - 12V DC, 1.2 GPM, 35 PSI with Adjustable Pressure Switch, Self-Priming, Quiet Operation for RV, Boat, and Off-Grid Applications" brand: "seaflo" price: "€ 72.80" currency: EUR in_stock: true reviews_count: 13 category: "Seaflo" url: https://www.desertcart.hr/products/26770777-seaflo-21-series-water-pressure-diaphragm-pump-12v-dc-1 store_origin: HR region: Croatia --- # 12V DC power 3.0 GPM flow rate 55 PSI pressure SEAFLO 21-Series Water Pressure Diaphragm Pump - 12V DC, 1.2 GPM, 35 PSI with Adjustable Pressure Switch, Self-Priming, Quiet Operation for RV, Boat, and Off-Grid Applications **Brand:** seaflo **Price:** € 72.80 **Availability:** ✅ In Stock ## Summary > 🚿 Pump up your off-grid lifestyle with quiet, reliable water flow! ## Quick Answers - **What is this?** SEAFLO 21-Series Water Pressure Diaphragm Pump - 12V DC, 1.2 GPM, 35 PSI with Adjustable Pressure Switch, Self-Priming, Quiet Operation for RV, Boat, and Off-Grid Applications by seaflo - **How much does it cost?** € 72.80 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/26770777-seaflo-21-series-water-pressure-diaphragm-pump-12v-dc-1) ## Best For - seaflo enthusiasts ## Why This Product - Trusted seaflo brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built to Last 4 Years:** Industry-leading 4-year warranty ensures long-term durability and peace of mind - • **Effortless Installation:** Standard 1/2"-14 MNPT ports and mounting pattern for quick, hassle-free setup - • **Reliable 12V Powerhouse:** Efficient 12V operation perfect for marine, RV, and off-grid setups - • **Whisper-Quiet Performance:** Integrated bypass and rubber base minimize noise and vibration - • **Consistent Flow & Pressure:** Delivers steady 3.0 GPM at 55 PSI for uninterrupted water supply ## Overview The SEAFLO 42 Series On Demand Water Pressure Pump is a robust 12V DC pump delivering 3.0 GPM at 55 PSI, designed for marine, RV, and off-grid water systems. Featuring self-priming up to 6 feet, an internal bypass to reduce cycling and noise, and durable Santoprene and EPDM components, it ensures smooth, quiet, and reliable water delivery. Certified for potable water and backed by a 4-year warranty, this pump offers easy installation with standard fittings, making it the go-to choice for professionals seeking dependable, long-lasting performance. ## Description desertcart.com: SEAFLO 21-Series Water Pressure Diaphragm Pump - 12V DC, 1.2 GPM, 35 PSI with Adjustable Pressure Switch, Self-Priming, Quiet Operation for RV, Boat, and Off-Grid Applications : Automotive Review: Works well - Easy installation and good instructions for one to follow. Hooked it up to my garden irrigation system and working well as advertised. Review: Well made pump. - Works great. Shut up and buy it. Brand name. I also own a larger one. ## Features - [ SPECIFICATIONS ]: Model: SFDP1-012-035-21 | Voltage: 12V DC | Open Flow: 1.2 GPM (4.5 LPM) | Shut-Off Pressure: 35 PSI (2.4 BAR) | Current Draw: 4.0A | Self-Priming: Up to 4 ft (1.2 m) | Ports: 3/8" Hose Barb | Max Temperature: 140°F (60°C) | Leads: 18 AWG, 13" (33 cm) | Duty Cycle: Intermittent | Ignition Protected | Certifications: RoHS SGS ISO | Warranty: 4 Years - [ 4 YEAR WARRANTY ]: Backed by SEAFLO’s industry-leading 4-Year Limited Warranty, this compact diaphragm pump is built for long-term reliability in RV, marine, and off-grid freshwater systems. Designed for continuous real-world use, it provides dependable operation and peace of mind wherever consistent water delivery is essential for comfort and functionality. - [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 - [ ULTRA LOW AMP DRAW EFFICIENCY ]: Consuming only 4.0 amps, this pump is ideal for battery-powered systems, solar installations, vans, and small boats where power conservation is critical. It delivers dependable water flow for a single sink or fixture without draining your battery bank, making it a superior choice for energy-conscious off-grid users. - [ SUPER QUIET OPERATION ]: Engineered for minimal noise, the pump runs no louder than a typical room fan. Rubber isolation feet reduce vibration transfer to surrounding surfaces, creating a comfortable environment in sleeping areas, cabins, and enclosed RV spaces where loud pumps can be disruptive. - [ COMPACT SINGLE FIXTURE DESIGN ]: Optimized for one sink or light-duty use, this small footprint pump fits tight installations where larger pumps cannot. Perfect for van conversions, small campers, boats, kiosks, or auxiliary water systems, it provides reliable performance without unnecessary size or weight. - [ ON DEMAND PRESSURE SWITCH ]: The built-in automatic pressure switch starts the pump when a faucet opens and stops it when closed, eliminating the need for an accumulator tank. This ensures convenient operation, reduced water waste, and consistent pressure for everyday use. - [ ADJUSTABLE PRESSURE SETTING ]: Fine-tune the pump’s shut-off pressure to match your plumbing system requirements. This flexibility helps protect delicate fixtures, reduce cycling, and optimize performance across a wide range of applications from marine galleys to portable water systems. - [ SELF PRIMING DRY RUN SAFE ]: Self-primes up to 4 feet for flexible installation above or below the water tank. The pump can run dry without damage during intermittent use, while built-in thermal protection prevents overheating, extending service life in demanding conditions. - [ DURABLE IGNITION PROTECTED BUILD ]: Constructed with a Santoprene diaphragm, corrosion-resistant materials, and ignition protection for marine environments, this pump meets or exceeds RoHS, SGS, and ISO standards. The industry-standard mounting pattern allows easy replacement of similar small pumps. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00DLKT4OO | | Best Sellers Rank | #3,198 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #1 in Boat Water Pressure Pumps #3 in RV Water Pumps & Accessories | | Brand | SEAFLO | | Brand Name | SEAFLO | | Color | Black | | Customer Reviews | 4.4 out of 5 stars 1,842 Reviews | | Flow Rate | 1.2 Gallons Per Minute | | Global Trade Identification Number | 00637776645502, 00640674580349, 00787721093749, 00810039498149, 06410038780111 | | Included Components | 4-Year Warranty Card, Instructions, SEAFLO 21 Series Water Pressure Diaphragm Pump (SFDP1-012-035-21) | | Item Dimensions L x W x H | 6.65"L x 3.94"W x 2.44"H | | Item Weight | 1.5 Pounds | | Manufacturer | Seaflo | | Manufacturer Part Number | SFDP1-012-035-21 | | Material | Polypropylene (PP) | | Material Type | Polypropylene (PP) | | Maximum Lifting Height | 4 Feet | | Model Number | SFDP1-012-035-21 | | Power Source | 12V DC (2-Pin Wire not Houseplug) | | Product Dimensions | 6.65"L x 3.94"W x 2.44"H | | Product Style | 1.2 GPM - 35 PSI | | Specific Uses For Product | Potable Water Pump | | Style | 1.2 GPM - 35 PSI | | UPC | 640674580349 787721093749 615200881986 637776645502 | | Voltage | 12 Volts (DC) | ## Product Details - **Brand:** SEAFLO - **Color:** Orange - **Item Weight:** 4.8 Pounds - **Maximum Flow Rate:** 3 Gallons Per Minute - **Maximum Lifting Height:** 6 Feet - **Power Source:** DC - **Product Dimensions:** 7.97"L x 4.92"W x 4.37"H - **Style:** 3.0 GPM - 55 PSI - **Voltage:** 12 Volts (DC) ## Images ![SEAFLO 21-Series Water Pressure Diaphragm Pump - 12V DC, 1.2 GPM, 35 PSI with Adjustable Pressure Switch, Self-Priming, Quiet Operation for RV, Boat, and Off-Grid Applications - Image 1](https://m.media-amazon.com/images/I/614G+HCBm9L.jpg) ![SEAFLO 21-Series Water Pressure Diaphragm Pump - 12V DC, 1.2 GPM, 35 PSI with Adjustable Pressure Switch, Self-Priming, Quiet Operation for RV, Boat, and Off-Grid Applications - Image 2](https://m.media-amazon.com/images/I/71UnV-NNfPL.jpg) ![SEAFLO 21-Series Water Pressure Diaphragm Pump - 12V DC, 1.2 GPM, 35 PSI with Adjustable Pressure Switch, Self-Priming, Quiet Operation for RV, Boat, and Off-Grid Applications - Image 3](https://m.media-amazon.com/images/I/61MzEseI9CL.jpg) ![SEAFLO 21-Series Water Pressure Diaphragm Pump - 12V DC, 1.2 GPM, 35 PSI with Adjustable Pressure Switch, Self-Priming, Quiet Operation for RV, Boat, and Off-Grid Applications - Image 4](https://m.media-amazon.com/images/I/61bCLlDAikL.jpg) ![SEAFLO 21-Series Water Pressure Diaphragm Pump - 12V DC, 1.2 GPM, 35 PSI with Adjustable Pressure Switch, Self-Priming, Quiet Operation for RV, Boat, and Off-Grid Applications - Image 5](https://m.media-amazon.com/images/I/91VfzPIIYiL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: Lousy house pressure, if I connect outlet of garden faucet to inlet of this pump will I get better outlet pressure to drive an impact type sprinkler?** A: No it will not do anything for you... This is also 12V not 110 so maybe you should look into your houses old plumbing or contact city about your low water pressure **Q: Automatic shut off?** A: Yes it has a pressure switch that shuts it off when you shut the flow of water off **Q: What is the power usage for this motor? Amp hours would be best, but pretty much any measure would be helpful.** A: This is a 12V DC water pressure pump. The max amperage draw is 7.5 Amps. All technical specifications on the pump can be found here: http://seaflo.com/en-us/product/detail/609.html **Q: What is the wattage need when using a power supply** A: On the placard for the product that I bought, as well as in the product specs, the amperage is listed as 3.5A, with a maximum of 7.5A(presumably when the pump starts). Ohm’s law states that P=VI, so this yields an average of 12V*3.5A = 42W with a worst case of 12V*7.5A=90W. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works well *by M***L on April 10, 2026* Easy installation and good instructions for one to follow. Hooked it up to my garden irrigation system and working well as advertised. ### ⭐⭐⭐⭐⭐ Well made pump. *by D***R on February 9, 2026* Works great. Shut up and buy it. Brand name. I also own a larger one. ### ⭐⭐⭐⭐⭐ EXCELLENT water pump - and great seller. *by S***T on June 9, 2014* I'll update this review when I actually RECEIVE the product, but currently I'm going on 6 weeks for actual delivery of this. I ordered it May 1 and as of June 9, still no pump. The delivery time period shows sometime between May 28 and June 14 (no PRIME shipping was available when I purchased it - but I see it is NOW...), but every other product I've ever ordered from Amazon with such a broad shipping timeframe still arrives within 2 weeks... With several other reviews on here saying they got theirs quickly, I'm getting concerned my order was lost and I may be out $28... I hope not, but I can only assume they're shipping this from China on a row boat, it encountered a monster storm, sank, had to be retrieved by a submarine, was placed on another row boat, Nigerian pirates commandeered the second row boat and are holding my pump for ransom... You get the idea. I trust it'll be a good product when it does arrive, but I hope the 2014 camping season isn't completely over by the time it does. I need this for my popup trailer now! Two separate orders for LED lightbulbs placed on the same day and given the same broad shipping time period were received several weeks ago. This is getting a bit ridiculous. I'll update this with a review of the product itself when it does arrive. Shipping sucks though. Pay for 2-day shipping. I wish I knew that when I bought it. I may not have time to install this before our second trip. I'm already going to miss out on it for our first trip this year. UPDATE: I was supposed to receive the pump by June 13, but that date came and went. I had little-to-no expectation of receiving a refund for some reason, but contacted the seller and explained the problem. They answered promptly and refunded my money within a couple of days. I went ahead and re-ordered (this time with PRIME shipping) and received the pump yesterday on-time. I will install it in my popup trailer in a couple of days and update the review with the pumps functionality at that time. Great response by the seller though! UPDATE PART 2: I finally got to the install today and found like other buyers that it came with no instructions whatsoever. Power wires are pretty self-explanatory (red is +, black is -), but the inlet/outlet ports weren't even labeled. I connected 3/8" tubing to each side and after a quick test on my popup trailer battery found that left is inlet, right is outlet. Install went smooth and easy. I t'd into the water line for the hand-pump side of my faucet (Leisure Components faucet purchased on Amazon) and plugged into the inlet of the pump. From the outlet I plugged the hose into a t'd connection I installed in the city water hose. Wired it up and tapped into the power wire for my thermostat, grounded to the frame, and I was good to go. I installed a toggle on/off switch so that I can bypass the water pump entirely if need-be for some reason. The pump is a little bit noisy by itself, but once the dinette cushions are back on and particularly if there are some additional items in the space under the dinette seat, it's actually very quiet and muffled. The reviewers who claim it's loud enough to wake up the whole campground are exaggerating a TON. The mounting feet are thick rubber to help dampen the noise and not spread vibrations through the trailer frame, but I cut up an old mouse pad and used that as a buffer between the pump and trailer frame as well to help with that even more. All things said, I'm extremely pleased with the purchase. I can still pump water with the faucet as normal, can plug into city water if available, and can use the water pump itself for those times my family doesn't want to have to pump water from the facet when we're boondock camping. The $30 price tag and free shipping simply can't be beat either. AWESOME product! ## Frequently Bought Together - SEAFLO 42 Series 12V 3.0 GPM 55PSI Continuous Duty Diaphragm Pump with Bypass for Reduced Cycling, Fresh/Salt Water, 4-Year Warranty, UL & CSA Certified, Self-Priming for Marine, RV, Off-Grid, Boats - SEAFLO Accumulator Tank Water Pump Flow Control with Internal Bladder - 125 PSI, 23.5 oz (0.75 L) | Reduces Pump Cycling and Smooths Water Flow for Marine, RV, and Off-Grid Systems --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/26770777-seaflo-21-series-water-pressure-diaphragm-pump-12v-dc-1](https://www.desertcart.hr/products/26770777-seaflo-21-series-water-pressure-diaphragm-pump-12v-dc-1) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-06-20*