HORUSDY200cc Fluid Extractor, Oil Extractor/Oil Syringe, Fluid Syringe Pump Manual Suction Vacuum Fuel Car Transfer

I inserted the tube extension into the extractor to test it. after that, i was unable to remove the tube. what should i do to disconnect?

can i use this to remove transmission fluid from dipstick will it reach the bottom?

What is the lubricant inside? Is it safe to transfer fluids with. Will it contaminate whatever I'm transferring?

What do you use to lubricate the rubber plunger, vaseline?