Does it have / need oil or lubricant? Would keg lube work?

no need to lube. just plug and run it in water.

Where exactly is the inlet? If used as a small sump pump, how much water will be left?

The inlet is in the middle of the pump, in the front. So, whether you stand it up like it is in the picture or lay it down on its side, you would have at least 1", maybe 2" of water left. Hope this helps.

Is this pump strong enough to lift the water 5ft out of a sump and into the main saltwater tank?

Yes, I have used it to drain, fill both my fresh and salt tanks from the floor up to about 6ft and drain from the top of the tank to the floor for water changes. It is a very powerful and quick pump, many water oops when draining cause so fast. Left outside to air dry after cleaning off saltwater with ro water and someone took it and the hosing so buying another.

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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VIVOSUN 800GPH Submersible Fountain Water Pump for Pond, Aquarium, Statuary | 3000L/H, 50W, Ultra Quiet Water Pump with 10ft. High Lift and 6.5ft. Power Cord, 3 Nozzles for Hydroponics, Green

Product ID: 100448125

Details

Brand
VIVOSUN
Color
Green
Item Weight
2 pounds
Material
Plastic
Maximum Flow Rate
3000 liters
Maximum Lifting Height
10 feet

💧800 GPH max flow

📏10 ft max lift height

🔇Ultra quiet operation

$68.00

Duties & taxes included

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Description

💧 Elevate your water game with silent power and precision!

POWERFUL 800 GPH FLOW - Delivers a robust 3000L/H to keep your aquatic setups thriving.
WHISPER QUIET PERFORMANCE - Operates silently so your space stays peaceful and professional.
VERSATILE 10 FT LIFT HEIGHT - Reaches impressive heights for fountains, hydroponics, and more.
CUSTOMIZABLE WATER PRESSURE - Adjust flow easily with control knob and 3 nozzle options for perfect water dynamics.
EFFORTLESS MAINTENANCE PLACEMENT - Tool-free disassembly and flexible mounting options fit any environment seamlessly.

The VIVOSUN 800GPH Submersible Pump is a compact, energy-efficient 50W pump delivering up to 3000 liters per hour with a 10-foot lift height. Designed for ultra-quiet operation, it features adjustable flow control, three interchangeable nozzles, and versatile mounting options, making it ideal for aquariums, fountains, hydroponics, and irrigation systems.

Specifications

ASIN	B07L54HB83
Best Sellers Rank	#1,481 in Pet Supplies ( See Top 100 in Pet Supplies ) #1 in Aquarium Water Pumps
Brand Name	VIVOSUN
Color	Green
Customer Reviews	4.4 4.4 out of 5 stars (25,942)
Flow Rate	3000 liters per hour
Horsepower	24 watts
Item Dimensions L x W x H	4.33"L x 3.5"W x 4.1"H
Item Weight	2 pounds
Manufacturer	VIVOSUN
Manufacturer Part Number	B07L54HB83
Material Type	Plastic
Maximum Lifting Height	10 feet
Model Number	332572J
Power Source	ac
Product Style	Submersible
Specific Uses For Product	Inside
Unit Count	1 Count
Voltage	110 volts

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