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.

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🛢️ Pump up your maintenance game—efficiency meets durability!

BUILT TO ENDURE - Premium materials and machined exterior ensure long-lasting, reliable performance.
EFFORTLESS REACH - Engineered for tight spaces—no more awkward, messy oil changes.
PATENTED INNOVATION - Exclusive US Patent 7,857,172 guarantees unmatched quality and design.
TIME COST EFFICIENCY - Cut down oil change time and avoid fluid waste, saving you money every time.
DUAL THREADED VERSATILITY - Seamlessly pumps from both quart and gallon containers with patented double-threaded cap.

The Performance Tool W1139 is a patented, dual-threaded fluid pump designed for both quart and gallon containers, making oil changes faster, cleaner, and more efficient. Its durable construction and ergonomic design ensure reliable use in hard-to-reach areas, saving time and reducing waste for professional-grade vehicle maintenance.

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Manufacturer	Wilmar Corporation
Brand	PERFORMANCE TOOL
Model	Quart/Gallon
Product Dimensions	25.65 x 16.26 x 0.51 cm; 95.25 g
Item model number	W1139
Exterior	Machined
Manufacturer Part Number	W1139
OEM Part Number	W1139
Item Weight	95.2 g

Performance Tool W1139 Quart/Gallon Fluid Pump and Hose for Vehicle Oils and Maintenance

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