Let's be carefull out there
Join Date: Jan 2006
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Welcome to the forum, I know someone has just been quoted about £450 to have one done.
As for purpose, it will be to allow the ATF to be shunted to whatever part of the gearbox needs it in order to shift gears, clutches etc.
I has a look at the guts of my autobox a couple of years back when it was having some surgery and decided not too look anymore, too many bits.
Currently in chris m's garage:
2000 Scenic 2.0 16v Monaco, BMW 3 Series, Pug 206