Cordless ATF Extractor Pump for 18V and 20V Tool Batteries

If you already own cordless tools, this transfer pump turns one of those batteries into a fluid pump for ATF, gear oil and engine oil. It is a 100W electric pump rated up to 8.66 liters per minute, built for emptying drain pans, filling differentials and manual gearboxes through the fill plug, and moving bulk transmission fluid without hand pumping or an air compressor.

How it runs and what it powers from

The pump takes Makita 18V LXT batteries directly. A removable adapter in the box lets it run on Milwaukee M18 and DeWalt 20V MAX packs, and an alligator-clip lead connects it to any 12V vehicle battery when you have a long job or a dead tool pack. No battery is included. Because there is no air line and no cord to an outlet, it works in a driveway, under a lifted truck or at a drum in the corner of the shop.

What 8.66 liters per minute means on a fluid service

GM's 2025 TechLink fluid capacity chart lists a fluid-change amount of 7.0 liters for the 8L80 and 7.7 liters for the 10L80, and 13.6 liters for the 10L1000. At the pump's rated flow, that is roughly a minute to move the fluid from a typical car or light truck drain-and-fill out of the drain pan, and under two minutes for the heavy-duty unit. Real flow drops with thick or cold oil, a long hose and lift height, so expect gear oil to move slower than warm ATF.

Jobs it is built for

• Emptying a drain pan into a waste container after a pan drop or drain-and-fill
• Filling a rear differential, transfer case or manual transmission through the side fill plug from a jug
• Pulling a measured amount of ATF from a drum into a container so you know exactly what went in
• Moving hydraulic oil or diesel between containers

It is rated for automatic transmission fluid, gear oil, engine oil, hydraulic oil and diesel. It is not for gasoline or water.

Using it on a transmission fluid service

Most of the mess on a drain-and-fill happens after the fluid is out: a heavy, sloshing pan on the floor. Run the pickup hose into the pan and the outlet into a sealed container and you never have to lift it. Before you pump the old fluid away, look at it and smell it. Our ATF color and smell diagnosis chart shows what dark, burnt or milky fluid is telling you, and the transmission drain and fill guide covers how to measure what came out so you put the same amount back.

For refilling, the pump is a good fit on units with a fill plug that sits up high or on the side of the case. On a GM unit with a dedicated fill port, an adapter like the GM ATF filler adapter gives you a clean connection. Use the fluid your transmission specifies, such as ACDelco Dexron VI for the GM units that call for it, and always finish the fill by checking level at the correct temperature with the engine running, as the factory procedure says. A pump moves fluid; it does not set the level for you.

Hose, filter and setup notes

• The 10 ft, 12 mm hose can be cut to length. Shorter hose means faster flow.
• A reusable stainless mesh filter goes on the pickup end to keep clutch material, sludge and metal fines out of the pump. It needs an opening wider than 30 mm (1.18 in.), so remove it and run bare hose into a small fill port.
• Clean the filter after any fluid with debris in it. If you see a lot of metal in the screen, read flush vs drain and fill before deciding how to service that transmission.
• Prime by keeping the pickup submerged; avoid running it dry for long periods.
• Recycle used ATF and gear oil at a collection point. Never pour it on the ground or into a drain.

Which batteries does this pump work with?

Makita 18V LXT batteries fit directly. Milwaukee M18 and DeWalt 20V MAX packs work with the included removable adapter. It can also run from a 12V vehicle battery using the alligator clips. No battery comes in the box.

Can I pull ATF out through the dipstick tube with it?

It is a transfer pump with a 12 mm hose, not a dipstick extractor, and the mesh filter needs an opening wider than 30 mm. It works best from a drain pan, a drum, or directly through a large fill opening.

Will it pump gear oil into a differential?

Yes. It is rated for gear oil. Thick oil, especially cold, moves slower than ATF, so warm the jug if you can and keep the hose short.

Can I use it for gasoline or coolant?

Do not use it for gasoline or water. It is rated for ATF, gear oil, engine oil, hydraulic oil and diesel.

How fast does it empty a drain pan?

The rated flow is up to 8.66 liters per minute. A typical drain-and-fill of around 7 liters moves in about a minute with warm fluid and a short hose; thicker fluid and longer hose slow it down.

• How to Do a Transmission Drain and Fill at Home (Step by Step)
• ATF Color and Smell: What Your Transmission Fluid Is Telling You
• Transmission Flush vs. Drain and Fill: What the Machines Actually Do and When to Use Each
• How to Change Automatic Transmission Fluid the Right Way (Drain, Flush, or Exchange)