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The GB has a purely mechanical tap with 3 positions being OFF - ON (main tank) and RES (reserve supply) Because the question asked related to the GB, I'm not sure why someone has added the XBR to the equation. Maybe it has a different tap,. I don't know. What I so know is that it is quite easy to undo the GB tap using a big shifter set at about 26mm. If you have a big openender of this size, that would be even better to use but this is a seriously big size for an oe spanner.Just turn the big nut anti clockwise and the whole tap assembly will come free.from the tank.
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