The flushing bit ?
With a simple drain and refill you usually only half or less of the old fluid out, flushing replaces all that fluid that sits in the converter and galleries.
With my car the outlet is a rubber hose onto a barb of the radiator, i attach a 2m length of hose to the outlet and put the end in a clear measured container.
and the radiator barb has a 1m hose connected to a 2ltr pressure garden sprayer.
I fill the sprayer with fresh fluid and pressurise it, then start the car and watch the old fluid pump out til you get approx. the same volume as what the pan holds, stop the engine and replace that 4ltrs with fresh fluid. Do that that again til you have reaplaced the full volume of fluid that the trans holds then do another 2-4ltrs.
Then run up to the correct temp (30c in my case) then open the level plug and check the level and top up if required.
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