Yes it has a pressure switch that shuts it off when you shut the flow of water off

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Seaflo 42 Series Diaphragm Pump with Bypass for Reduced Cycling 12V/24V 3.0GPM 55PSI (12 Volts)

Seaflo 42 Series Diaphragm Pump with Bypass for Reduced Cycling 12V/24V 3.0GPM 55PSI (12 Volts)

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?

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: What is the power usage for this motor? Amp hours would be best, but pretty much any measure would be helpful.

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

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.

Product ID: 205500056

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Details

Brand
Seaflo
Colour
Orange
Material
Pump head:
Style
Diaphragm
Product dimensions
20.2L x 12.5W
Power source
Corded

⚡12V/24V dual voltage power

💧3.0 GPM high flow rate

🔄Bypass tech reduces cycling

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

Description

💧 Pump up your efficiency with power and precision!

POWERFUL COMPACT - Delivers a robust 55 PSI pressure in a sleek, space-saving design perfect for tight installations.
DURABLE CERTIFIED - UL 778 & CSA 22.2 certified with premium Santoprene diaphragm and EPDM valves for long-lasting reliability.
ADAPTIVE FLOW CONTROL - Bypass technology minimizes wear by reducing pump cycling, extending lifespan and efficiency.
PEACE OF MIND WARRANTY - Backed by a 4-year warranty, ensuring your investment is protected and performance guaranteed.
VERSATILE APPLICATIONS - Ideal for marine, RV, agricultural spraying, filtration, and solar water systems—your all-in-one pump solution.

The SEAFLO 42 Series Diaphragm Pump is a 12V/24V positive displacement pump delivering 3.0 GPM at 55 PSI. Featuring bypass technology to reduce cycling, it’s self-priming and capable of dry running. Certified UL 778 & CSA 22.2, it’s built with durable Santoprene diaphragms and EPDM valves, ideal for marine, RV, agricultural, and industrial applications. Compact, efficient, and backed by a 4-year warranty, it’s engineered for professionals who demand reliability and adaptability.

Specifications

Manufacturer	SEAFLO
Part Number	SFDP1-030-055-42
Product Dimensions	20.24 x 12.5 x 11.1 cm; 2.18 kg
Item model number	SFDP1-030-055-42
Size	12 Volts
Colour	Orange
Style	Diaphragm
Material	Pump head: nylon. Pump head cover: PPS. Motor housing: polypropylene. Valves/seals: EPDM. Diaphragm: Santoprene
Power Source	Corded Electric
Voltage	12 Volts
Item Package Quantity	1
Flow rate	3 Gallons Per Minute
Included Components	51S01 Filter, 51F01 Fitting
Batteries included?	No
Batteries Required?	No
Item Weight	2.18 kg

Have a Question? See What Others Asked

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?

Automatic shut off?

What is the power usage for this motor? Amp hours would be best, but pretty much any measure would be helpful.

What is the wattage need when using a power supply

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