What size (diameter) are the hoses?

The outer thickness of the hose is 13 mm. I have 2 cars, I could insert the pump hose(s) in the pipe going into the transmission oil tank only 1 inch after which the pipe gradually narrowed so I could not use the pump on any of the 2 cars.

Can it be used for potable water?

Biggest issue I see is the grease/oil they use inside it. It feels like vasoline, but they might have used something else that isn't food grade/you wouldn't want in your water. I'd suggest washing it with a dish soap de-greaser, then sanitizing it completely, and lubricate it lightly with a food safe oil (coconut, vegetable oil, etc). Even then you're doing it at your own risk. I would consider this for pumping water that will later be filtered and/or treated and not pumping post-treated/filtered water. For that consider one of those hand pumps for water jugs they use on watercoolers (3/5gal).

Has anyone used this to fill differentials? How did that work out?

After looking at some options I went with some $5 option from a local auto parts store for my differential and transfer case. Worked just fine and saved a few bucks.

Performance Tool W1139 Quart Gallon Fluid Transfer Pump With Hose

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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$27.42

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Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛢️ Pump up your vehicle care game with patented precision!

BUILT TO ENDURE - Crafted with premium materials to withstand rigorous, repeated use without fail.
PATENTED PRECISION - Exclusive US Patent 7,857,172 guarantees innovative design and unmatched reliability.
TIME IS MONEY SAVER - Rapid fluid transfer cuts down oil change time, getting you back on the road faster.
EFFORTLESS MAINTENANCE - Ergonomically designed pump and hose reach tight spots, eliminating mess and frustration.
UNIVERSAL FIT ZERO HASSLE - Double threaded cap adapts seamlessly to quart and gallon containers for ultimate versatility.

The Performance Tool W1139 is a patented, versatile fluid pump designed to fit both quart and gallon containers. Engineered for durability and ease of use, it streamlines vehicle oil and fluid maintenance by enabling quick, mess-free transfers even in hard-to-reach areas. Its robust construction and innovative double threaded cap make it a reliable tool for professional-grade automotive upkeep.

Specifications

Manufacturer	Wilmar Corporation
Brand	Performance Tool
Model	Quart/Gallon
Item Weight	3.36 ounces
Product Dimensions	10.1 x 6.4 x 0.2 inches
Item model number	W1139
Is Discontinued By Manufacturer	No
Exterior	Machined
Manufacturer Part Number	W1139
OEM Part Number	W1139

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