---
product_id: 1962837
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: "VT19410"
currency: VUV
in_stock: true
reviews_count: 11
category: "Seaflo"
url: https://www.desertcart.vu/products/1962837-seaflo-21-series-water-pressure-diaphragm-pump-12v-dc-1
store_origin: VU
region: Vanuatu
---

# 12V DC power 1.2 GPM flow rate Adjustable 35 PSI pressure switch 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:** VT19410
**Availability:** ✅ In Stock

## Summary

> 💦 Elevate your water game—quiet, smart, and built for the road less traveled.

## 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?** VT19410 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/1962837-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

- • **Whisper-Quiet Water Flow:** Engineered vibration-absorbing mounts ensure near-silent operation—perfect for peaceful RV or boat living.
- • **Smart Self-Priming Design:** Effortlessly primes up to 6 feet, giving you flexible installation options without hassle.
- • **Plug-and-Play Installation:** Standard 3/8" hose barb ports and lightweight design make setup quick and easy—get running in no time.
- • **Built to Last with Thermal Protection:** Integrated thermal safeguard prevents overheating, extending pump life for worry-free adventures.
- • **Compact Powerhouse for Off-Grid Living:** Delivers consistent 1.2 GPM flow at 35 PSI, ideal for remote cabins, boats, and RVs demanding reliable water pressure.

## Overview

The SEAFLO 21-Series Water Pressure Diaphragm Pump is a compact, 12V DC pump delivering 1.2 gallons per minute at 35 PSI with an adjustable pressure switch. Its self-priming capability up to 6 feet and built-in thermal protection make it ideal for RVs, boats, and off-grid water systems. Designed for quiet operation with vibration-absorbing mounts, it ensures reliable, low-noise water pressure wherever you go.

## 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: So far appears to be a great value fresh pump. - Only 2 months in, so durability not evaluated yet. Overall whilst I haven't experienced any measure of longevity yet, the "fit, form and function" of this fresh pump seems to be quite the value for basic needs such as mine. Surely not the same total experience as a higher flow pump with multiple diaphragms and increased noise abatement, but for those who don't need such a premium experience (with quite dear costs) this pump is quite nice and presents much better value IMO. Bottom line: - Noise level: Not measured, but quite acceptable to me. With it mounted directly under the berth I *do* hear it throughout the boat, however at absolutely minimal volumes that I don't foresee waking anyone except the lightest sleeper. If the tank goes empty and it starts pushing air it will hammer a bit. Some day I'll break out the db meter and measure this. - On demand sensing works great - when I turn on the faucet, water is there and continues to be there. This is perhaps the most important aspect to creating an "at home" experience - no footswitches or pumps, not buttons, just a regular ole faucet. - No hammering or surging even with just a single diaphragm until water gets low - if it starts drawing air then it hammers. To be frank I like this as I don't have a gauge in my fresh tank, so this acts as my alert that water if very low. - While I have only two faucets, the flow is quite sufficient. Wash dishes, even rinse down cabin floor or countertop without any problem. - Same install as any other pump, quite easy particularly when combined with pex. I have to remind myself to take some photos / videos for everyone. I used this to replace a manual freshwater plumbing system in my sailboat and honestly I kind of hate the maritime industry, so when I saw an item that was more appropriately priced for it's design and manufacturing costs, I decided to give it a try. I'm very glad I did, this little guy so far is proving itself out very nicely. I've already recommended it to several rag haulers who are still pumping faucets.
Review: Amazingly quiet and effective pump for our RV - We have an older (1991) motorhome that still had its original water pump. Since we bought the RV when it was already 27 years old, we didn't think much about how noisy the old pump was when it ran and how much it vibrated all the pipes. It got so bad that it actually cracked a PEX connector in my plumbing from all the vibration. Fortunately we caught it before too much of a flood. That was the incentive to look for a better pump in hopes of getting one that would be quieter and not vibrate the whole RV when you flushed the toilet. After doing quite a bit of research and looking at reviews we chose the SeaFlo pump. It's a good name brand and had a reputation of being relatively quiet. We couldn't be happier with it. We installed it with a SeaFlo Accumulator tank (0.75 l) and after hooking it up and wiring it up I went ahead and turned it on. At first I thought it wasn't working because I didn't hear ANYTHING! However the water started coming out the faucet and when I got closer to it or put my hand on the pump it was clear it was in fact working, but was living up to its QUIET reputation. I highly recommend this pump. You could spend less on a cheap knockoff import unit, but seriously is it really worth saving a few dollars on something that probably won't last and may be rather noisy when you can get the best with SeaFlo. And no, I'm not paid by SeaFlo to do this review, I'm just incredibly impressed with the quality and want to share that.

## Features

- SPECIFICATIONS – Model: SFDP1-012-035-21 | Voltage: 12V DC | Flow Rate: 1.2 GPM | Max Pressure: 35 PSI | Self-Priming | Diaphragm Material: Santoprene | Inlet/Outlet Ports: 3/8" Hose Barb | Max Temp: 140°F
- QUIET AND EFFICIENT OPERATION – Engineered for minimal noise with vibration-absorbing mounts and a robust diaphragm design, providing consistent, quiet water flow for a comfortable experience in your RV, boat, or off-grid setup.
- SELF-PRIMING AND THERMALLY PROTECTED – Self-priming up to 6 feet, allowing for flexible installation options above your water tank; built-in thermal protection safeguards the pump from overheating for extended durability.
- VERSATILE APPLICATIONS – Perfect for RVs, boats, and off-grid water systems, this compact and efficient pump meets diverse water needs, from providing water on remote sites to pressurizing cabin fixtures and marine systems.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00DLKT4OO |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #1,168 in Automotive ( See Top 100 in Automotive ) #1 in RV Water Pumps & Accessories #1 in Boat Water Pressure Pumps |
| Brand | SEAFLO |
| Color | Black |
| Customer Reviews | 4.4 4.4 out of 5 stars (8,490) |
| Date First Available | June 24, 2013 |
| Global Trade Identification Number | 00637776645502, 00640674580349, 00787721093749, 00810039498149, 06410038780111 |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 1.5 pounds |
| Item model number | SFDP1-012-035-21 |
| Manufacturer | Seaflo |
| Material | Polypropylene (PP) |
| Maximum Flow Rate | 1.2 Gallons Per Minute |
| Maximum Lifting Height | 4 Feet |
| Part Number | SFDP1-012-035-21 |
| Power Source | DC |
| Product Dimensions | 6.65"L x 3.94"W x 2.44"H |
| Size | 12 |
| Special Features | Pressure switch |
| Style | 1.2 GPM - 35 PSI |
| UPC | 640674580349 787721093749 615200881986 637776645502 |
| Voltage | 12 Volts (DC) |

## Product Details

- **Brand:** SEAFLO
- **Color:** Black
- **Item Weight:** 1.5 Pounds
- **Material:** Polypropylene (PP)
- **Maximum Flow Rate:** 1.2 Gallons Per Minute
- **Maximum Lifting Height:** 4 Feet
- **Power Source:** DC
- **Product Dimensions:** 6.65"L x 3.94"W x 2.44"H
- **Style:** 1.2 GPM - 35 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/61112CVoZEL.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: which side is the inlet ?**
A: There is an arrow pointing from one end to the other. Inlet is the end the arrow starts from. Direction of flow is parallel to the arrow.

**Q: can the cut off pressure be regulated/adjusted to about 15psi?**
A: This pump is built with 35psi switch and  can not adjusted to 15psi. Thank you!

**Q: Im looking to make a water misting system off the side of my rv. Would this pump be good to run for several hours continuously?**
A: Yes, it will run continuously for several hours. I've run it as a transfer pump when needed, and had it running for an entire day. Works great.

**Q: Is it a wash down pump?**
A: This pump can be used as a wash down pump. Thank you!

## Customer Reviews

### ⭐⭐⭐⭐⭐ So far appears to be a great value fresh pump.
*by M***N on September 30, 2022*

Only 2 months in, so durability not evaluated yet. Overall whilst I haven't experienced any measure of longevity yet, the "fit, form and function" of this fresh pump seems to be quite the value for basic needs such as mine. Surely not the same total experience as a higher flow pump with multiple diaphragms and increased noise abatement, but for those who don't need such a premium experience (with quite dear costs) this pump is quite nice and presents much better value IMO. Bottom line: - Noise level: Not measured, but quite acceptable to me. With it mounted directly under the berth I *do* hear it throughout the boat, however at absolutely minimal volumes that I don't foresee waking anyone except the lightest sleeper. If the tank goes empty and it starts pushing air it will hammer a bit. Some day I'll break out the db meter and measure this. - On demand sensing works great - when I turn on the faucet, water is there and continues to be there. This is perhaps the most important aspect to creating an "at home" experience - no footswitches or pumps, not buttons, just a regular ole faucet. - No hammering or surging even with just a single diaphragm until water gets low - if it starts drawing air then it hammers. To be frank I like this as I don't have a gauge in my fresh tank, so this acts as my alert that water if very low. - While I have only two faucets, the flow is quite sufficient. Wash dishes, even rinse down cabin floor or countertop without any problem. - Same install as any other pump, quite easy particularly when combined with pex. I have to remind myself to take some photos / videos for everyone. I used this to replace a manual freshwater plumbing system in my sailboat and honestly I kind of hate the maritime industry, so when I saw an item that was more appropriately priced for it's design and manufacturing costs, I decided to give it a try. I'm very glad I did, this little guy so far is proving itself out very nicely. I've already recommended it to several rag haulers who are still pumping faucets.

### ⭐⭐⭐⭐⭐ Amazingly quiet and effective pump for our RV
*by R***S on March 12, 2025*

We have an older (1991) motorhome that still had its original water pump. Since we bought the RV when it was already 27 years old, we didn't think much about how noisy the old pump was when it ran and how much it vibrated all the pipes. It got so bad that it actually cracked a PEX connector in my plumbing from all the vibration. Fortunately we caught it before too much of a flood. That was the incentive to look for a better pump in hopes of getting one that would be quieter and not vibrate the whole RV when you flushed the toilet. After doing quite a bit of research and looking at reviews we chose the SeaFlo pump. It's a good name brand and had a reputation of being relatively quiet. We couldn't be happier with it. We installed it with a SeaFlo Accumulator tank (0.75 l) and after hooking it up and wiring it up I went ahead and turned it on. At first I thought it wasn't working because I didn't hear ANYTHING! However the water started coming out the faucet and when I got closer to it or put my hand on the pump it was clear it was in fact working, but was living up to its QUIET reputation. I highly recommend this pump. You could spend less on a cheap knockoff import unit, but seriously is it really worth saving a few dollars on something that probably won't last and may be rather noisy when you can get the best with SeaFlo. And no, I'm not paid by SeaFlo to do this review, I'm just incredibly impressed with the quality and want to share that.

### ⭐⭐⭐⭐⭐ BEST BUY EVER
*by B***9 on September 21, 2025*

1 Car Battery 1 Regular size hose 5/8 or 3/4 2 Hose iron Clumps or fasteners or whatever It works great, easy set up and it silent like it like a mini fan. The size fits anywhere, it looks pretty good and doesn't take up plenty of space. It last plenty long and it is durable I dropped it before I even used it for the first time. I thought that it would be the end of the world if it did not work, but it worked fine. The pressure is good i would get a few gallons in less than minutes. YES I WOULD BUY IT AGAIN.

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-02-14*