# Wassermann 3WDP4-45-12V RV Water Pump, 12V, 4 GPM, 45 PSI

12V DC power and up to 4 GPM make this self-priming pump suited to RV and camper freshwater systems.

- [Original product page](https://www.ofertitastop.com/us/product/wassermann-3wdp4-45-12v-rv-water)
- [View offer](https://www.ofertitastop.com/us/visit/wassermann-3wdp4-45-12v-rv-water)
- Market: US
- Language: en-US
- Currency: USD
- Product updated: 2026-10-27T00:19:04.027Z
- Brand: wassermann
- Model: 3WDP4-45-12V
- MPN: WDPC
- SKU: ofertitastop-us-162180
- Category: Hardware > Hardware Pumps > Utility Pumps
- Source store: amazon US
- Active deal: Yes
- Price: 56.99 USD
- Previous price: 59.99 USD
- Discount: 5%
- Rating: 4.4 / 5
- Reviews: 1488

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## Description

A 12V DC motor and self-priming design give the Wassermann 3WDP4-45-12V a practical role in RV and camper freshwater systems. It delivers up to 4 GPM at a 45 PSI pressure setting for everyday water use at sinks and other connected fixtures.

The built-in pressure switch starts the pump when a tap is opened and stops it when the tap is closed. That automatic operation makes it a convenient choice for a pressurized water setup without manual pump switching.

Its 12V power source suits RV, marine, camping, yacht, and garden applications where a compatible 12V supply is available. The pump is also presented as a replacement option for RV water systems.

## Technical overview

The combination of self-priming operation and an automatic pressure switch is designed for on-demand water delivery. In a camper, for example, opening a sink faucet prompts the pump to run, while closing the faucet signals it to stop. This setup is useful for regular freshwater access at a sink or bathroom fixture. A manually operated pump may suit a setup where water is controlled by switching the pump itself, this model is designed to respond to tap use instead.

- Voltage: 12 volts DC
- Flow rate: Up to 4 GPM
- Pressure: 45 PSI
- Maximum lifting height: 98 feet
- Inlet/outlet: 1/2 inch
- Dimensions: 8.15 x 5.12 x 4.86 inches
- Material: Plastic

The package includes the pump, two 1/2-inch barbed hose adapters, one 1/2-inch male-thread hose adapter, a debris filter, and a user manual. The supplied fittings and filter support connecting the pump to a freshwater line and help keep debris out of the system.

Buyer feedback commonly highlights installation, fit, water pressure, and use as a replacement pump, including under-sink applications. Experiences with durability and noise are mixed: some buyers report early failures, while descriptions of operating noise vary. These reports reflect individual experiences, not a guarantee of a particular outcome.

## Best use cases

This pump is suited to RV and camper owners setting up or replacing a 12V freshwater pump for sink and bathroom use. Its automatic pressure switch is useful when the system should respond to opening and closing a tap, and its stated flow and pressure provide concrete reference points when choosing a pump for a water system.

The listed applications also include marine, camping, yacht, and garden setups. For installation, match the system’s 12V DC supply and 1/2-inch inlet and outlet connections to the pump and fittings. The manufacturer also identifies a 12V battery or an RV/camper cigarette lighter socket as power options.

## Included in the package

The kit contains one 12V RV water pump, two 1/2-inch barbed hose adapters, one 1/2-inch male-thread hose adapter, one debris filter, and one user manual. Together, these components provide the main pump, connection fittings, and filter for a freshwater installation.

## Questions before you buy

**How does the pressure switch operate?** The pump starts automatically when you open a tap and shuts off when you close it, supporting on-demand water use.

**What power supply does it use?** It runs on 12V DC. The stated power options include a 12V battery or a cigarette lighter socket in an RV or camper.

**What connections are specified?** The inlet and outlet are 1/2 inch. The package includes two 1/2-inch barbed hose adapters and one 1/2-inch male-thread hose adapter.

## Buying verdict

The Wassermann 3WDP4-45-12V is a practical choice for a 12V RV or camper freshwater setup that calls for self-priming operation, a 45 PSI pressure setting, and automatic response to tap use. Its stated flow rate, connection size, and included fittings make it easier to assess for a replacement or new installation, while the pressure switch supports hands-off operation during everyday sink and bathroom use.

## Images

![Wassermann 3WDP4-45-12V RV Water Pump, 12V, 4 GPM, 45 PSI — 1](https://www.ofertitastop.com/i/KnFk3l47YPTZe8-zYiHvyCf7NakbYUwhBmmc5tddz73x22vT7kjxgBdy1qUzQJh_5K_m4EvvIeSu8KYqERcdS5Gqb_InsCnf72D3sr7u4jkp-yWr45kELIPpiA.jpg)

![Wassermann 3WDP4-45-12V RV Water Pump, 12V, 4 GPM, 45 PSI — 2](https://www.ofertitastop.com/i/PsrgBm27FHS7vXziZ6vBrbb6UL2JV64WR07Hw51xIEUWe2dVyhg7TvLcfNRHDqnmgZDGafSniXCjBIDsrbbYpG0I_h4OSZI6snc8F0HWxxwmbvCf.jpg)

![Wassermann 3WDP4-45-12V RV Water Pump, 12V, 4 GPM, 45 PSI — 3](https://www.ofertitastop.com/i/xeC9RuUAcmOMBLf0MdaU-xYbcXQ24DNd7hez0eLkUpWkuoi1tjzo_2Rg8YlVvfFaUstM51jpYaVU09eHoDGIpyh4DNDaJ58U5-uHMdPL89kw1seV_t6ecOuGQg.jpg)

![Wassermann 3WDP4-45-12V RV Water Pump, 12V, 4 GPM, 45 PSI — 4](https://www.ofertitastop.com/i/FkCS9zhBRumhbu6zoiezbQuCNdgSFzpXckb384YyuE4Ydt6xNcYCT-YWlc9PvrcS8Rkc0MhdE8h6oTGew86FSGK2Qo1mIUZm6DuyiPuu3dln0AnJGkwHFfY1Og.jpg)

![Wassermann 3WDP4-45-12V RV Water Pump, 12V, 4 GPM, 45 PSI — 5](https://www.ofertitastop.com/i/l9jv2ACZpcWum9xD_cHXh_hYNkJhT3vUOjFou1OPMDK_U-eZWcqit-vOQznCChbLZpxMeWmbnBM0GLxF6BhCtLT53-z7s8JKA_GG81oz-bWGcuZ4vHf81xpgHA.jpg)