Could I use it to pump water out of a large fish tank into the sink?

Yes, as long as it is sitting outside the tank.

Would this be able to pump water from a large rainwater tank in order to irrigate a poly tunnel soaker hose irrigation system?

I use the pump to transfer water from a pond to drain (2m3 per hour). If your hose irrigation system needs less then 2m3 per hour then it should fo the job. If your irrigation system a spray system not sure how far the spray will travel.

Does this require pressure to work? Im intending to use it to pump stationary water from a barrel into another barrel. Thanks

The pump needs to connect to DC 12V power. It can use to pump stationary water

What Power adaptor do I need to connect to this pump?

I used Canadian style cables with a 12 volt terminal connector. To battery

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LONGRUN 12V DC Water Pump, 3L/Min Self Priming Diaphragm Water Pump, 65 Psi High-Pressure for Caravan Camper Boat Shower Lawn Garden

LONGRUN 12V DC Water Pump, 3L/Min Self Priming Diaphragm Water Pump, 65 Psi High-Pressure for Caravan Camper Boat Shower Lawn Garden

Product ID: 452703285

Details

Brand
Longrun
Colour
Black
Manufacturer
LONGRUN
Material
Plastic
Maximum flow rate
3 Litres Per
Maximum lifting height
2.5 Metres

⚡12V DC power for versatile use

💧3L/min high-efficiency water flow

🔧65 PSI max pressure with auto shutoff

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€ 46.29

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Sold byAmazon IrelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💦 Pump up your outdoor lifestyle with LONGRUN’s smart, silent power!

DURABLE COPPER MOTOR - Premium pure copper coils ensure longevity and burn resistance.
SMART PRESSURE CONTROL - Auto on/off pressure switch protects pump and conserves energy.
EFFORTLESS INSTALLATION - Quick plug design means no-fuss setup—get running in minutes.
VERSATILE OUTDOOR READY - Perfect for caravans, boats, gardens, and outdoor showers—your all-in-one water solution.
WHISPER QUIET OPERATION - Soft rubber mounts minimize vibration noise for discreet performance.

The LONGRUN 12V DC Water Pump delivers a reliable 3L/min flow at 65 PSI, featuring a self-priming diaphragm design with intelligent overvoltage protection. Its high-quality copper motor and noise-reducing mounts make it ideal for caravans, boats, and garden use, combining durability with quiet, efficient performance.

Specifications

ASIN	B09D7T4FQ6
Best Sellers Rank	12,160 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 6 in Boat Water Pressure Pumps
Brand	Longrun
Colour	Black
Country of Origin	China
Customer Reviews	4.0 4.0 out of 5 stars (323)
Flow Rate	3 Litres Per Minute
Item Dimensions L x W x H	16.2L x 8.5W x 5H centimetres
Manufacturer	LONGRUN
Material	Plastic
Maximum Lifting Height	2.5 Metres
Model Number	3L
Power source	Battery Powered
Product Style	Diaphragm
UPC	732122536098
Unit Count	1.0 count
Usage	Home gardening, Boat maintenance, Camping activities, Lawn care
Voltage	12 Volts

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