since it doesn't come with a tube, what size? seems like something that should be included...

3/4" inner diameter tube. A lot of people aren't using tube and people that do tend to want different lengths of tube for their specific setup so we stopped including tube and lowered the price of the Oil Udder. Tube is available on our website or at most hardware stores as it's a standard size. Hope that helps!

Can this also be used for filters less than 3" in diameter?

Yes! As long as there is enough room to fit the oil udder in there.

what oil capacity does this have with cap on?

Generally speaking I would say one quart. I connected a clear plastic hose on the end so I could drain directly into a milk carton. I loosen the oil filter first with a cap socket attached to a long extension to break it loose. Then I attach the oil under onto the oil filter and make sure it is flush to the engine block, before you unscrew the filter. By looking at the hose you will know when the oil is done draining. I have a 2005 Ford F150 Triton 5.4 engine and t woks really well with no mess. Hope this helps you out.

Theres a picture that shows 3 different funnels but I cant find the biggest one. I would need it for 18 wheelers. Where can i find the big one?

The "XXL" is available on our website in limited quantities. More will be in stock later this winter.

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Oil Udder XL Oil Change Tool - Fits Oil Filters Up to 4" Diameter - Spill-Free Oil Filter Funnel with Magnet - Hands Free Magnetic Hold to Filter - Durable Nitrile Rubber Construction for Maximum Grip

Oil Udder XL Oil Change Tool - Fits Oil Filters Up to 4" Diameter - Spill-Free Oil Filter Funnel with Magnet - Hands Free Magnetic Hold to Filter - Durable Nitrile Rubber Construction for Maximum Grip

Product ID: 379010751

Details

Material
Rubber
Brand
OIL UDDER
Colour
Oil Udder XL -
Product Dimensions
10.2W x 17.8H
Wide End Diameter
4 Inches

🧲Built-in magnet secures drain plugs

🖐️Hands-free magnetic hold for spill-free oil changes

🛢️Fits oil filters up to 4" diameter

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Description

🛠️ Upgrade your oil change game—clean, quick, and spill-free every time!

HANDS FREE OPERATION - Magnetic hold frees your hands for a smoother, faster oil change experience in tight engine spaces.
SPILL FREE XL FUNNEL - Fits large 4" oil filters perfectly, directing every drop cleanly into your container—no mess, no stress.
MULTI FLUID COMPATIBLE - Ideal for engine oil, transmission fluid, and more—your all-in-one fluid draining solution.
MAGNETIC DRAIN PLUG CATCH - Never lose a drain plug again—secure it effortlessly with a powerful built-in magnet.
DURABLE NITRILE RUBBER GRIP - Engineered for maximum grip and longevity, built tough to handle every oil change with confidence.

The Oil Udder XL Oil Change Tool is a durable, nitrile rubber funnel designed for spill-free oil changes on filters up to 4" diameter. Featuring a built-in magnet to securely hold metal drain plugs, it enables hands-free, mess-free fluid draining for automotive, RV, and truck maintenance. Its wide-mouth XL design fits snugly over large oil filters, directing fluids cleanly into tanks or cans, making routine oil and transmission fluid changes faster, cleaner, and more efficient.

Specifications

Material	Rubber
Brand	OIL UDDER
Colour	Oil Udder XL - Old Version
Product Dimensions	10.2W x 17.8H Centimeters
Wide End Diameter	4 Inches
Manufacturer	OIL UDDER
Model	Oil Udder XL
Item model number	OU-1005
Manufacturer Part Number	OU-1005
Lift Type	Mechanical
Country of Origin	USA
Item Weight	259 g

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