SEAFLO 33 Series water pressure system on its mounting board

SEAFLO 33 Series 3-chamber diaphragm pump, 3.0 GPM

SEAFLO 33 Series pressure system features

SEAFLO pump with accumulator tank side view

SEAFLO pressure system features and benefits diagram

SEAFLO pump install diagram with water tank and heater

SEAFLO 33 Series pump, strainer and accumulator

SEAFLO

33 Series 3.0 GPM Water Pressure System

Name: 33 Series 3.0 GPM Water Pressure System
Brand: SEAFLO
Price: 185.0 USD

~~$195.00~~ $185.00 Save 5%

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Product variants

Pickup available at Sandy Vans HQ

Usually ready in 2-4 days

A pre-built water pump system that's quiet, steady and ready to plumb.

The SEAFLO 33 Series pressure set comes fully assembled on one mounting board: a 3-chamber diaphragm pump, strainer and pre-pressurized accumulator tank with quick-connect wiring. It delivers 3.0 GPM at a steady 45 PSI, enough for 3 fixtures, and can run dry without damage.

Fits: Universal 12V water systems in vans, RVs and boats. Not compatible: 24V systems.

3.0 GPM (11.3 LPM) at 45 PSI shut-off
Pre-assembled pump, strainer and accumulator on one board
Quiet, steady flow thanks to the accumulator
Self-priming up to 6 ft of lift
Runs dry without damage
1/2 in MNPT ports

Pair it with the Duoetto Gen 3 water heater.

See it on your van. Add the 33 Series 3.0 GPM Water Pressure System to your build in our 3D Van Builder and preview it on a real Sprinter before you buy.

Product Details

Why a pre-built pressure set

Assembling a pump, strainer and accumulator from parts takes fittings, leaks and guesswork. This set arrives built and mounted on a board, so you plumb two ports and connect power.

What you get

3.0 GPM pump
Strainer
Accumulator tank
Mounting board

Fitment & Compatibility

Fits: Universal 12V water systems in vans, RVs and boats

Not compatible with: 24V systems

Not sure your build qualifies? Reach out to our team.

Specifications

Brand	SEAFLO
Model	SFWSK1-030-045-002
Voltage	12V
Open flow	3.0 GPM / 11.3 LPM
Shut-off pressure	45 PSI / 3.1 bar
Max draw	8.0A
Suction lift	6 ft
Max water temp	140°F
Ports	1/2 in-14 MNPT
Fixtures	3-4
Noise	60 dB
Leads	16 AWG, 4.5 in, 2-pin connector
Duty cycle	Intermittent

What's in the Box

Pump, strainer and accumulator on a mounting board
Quick-connect wiring

DIY FriendlyEasy

Drilling RequiredYes, to mount the board

Screw the board down near your fresh tank, plumb the 1/2 in MNPT inlet and outlet, and connect 12V with an inline fuse. Reach out to our team at products@sandyvans.com or (619) 812-1903 with questions.

Tools You'll Need

Drill and driver
Pipe thread sealant
Wire crimper

See all Sandy Vans install videos & manuals →

How to choose a van water pump

1. Flow

How to choose: 3.0 GPM covers a sink and shower.

2. Noise

How to choose: An accumulator smooths flow and cuts cycling.

3. Install

How to choose: A pre-assembled set saves fittings and time.

Before you order

12V circuit planned
Fresh tank location set

How it stacks up

3.0 GPM at 45 PSI
Pre-assembled
Runs dry safely

How many fixtures can it run?

Up to 3 or 4, like a sink, shower and outdoor shower.

What fuse should I use?

It draws up to 8A. Size the fuse and wire to that load and your wire length.

Can it run dry?

Yes, without damage, though it's best to keep the tank filled.

Is it loud?

It's rated at about 60 dB, and the accumulator keeps it from cycling constantly.

Do you install products for customers?

Yes. Many SV products can be professionally installed at our San Diego shop. Reach out to our team to schedule. Email products@sandyvans.com or call 619-812-1903.

What is your shipping and return policy?

Most SV products ship free. For returns, see our Returns & Refunds policy or reach out to our team at products@sandyvans.com.

Can I reach a real person with questions?

Always. We are a small team in San Diego. Email products@sandyvans.com or call 619-812-1903 and you'll get a real answer, not a chatbot.

Where are you located?

9393 Trade Pl, San Diego, CA. Come visit the shop, we'd love to show you around.

Does Sandy Vans offer financing?

Yes. Many financing options are available. Set up a call with a sales associate to learn more.

Still have a question? Email the team and you'll get a real answer.