what screw do i undo to bleed a 50/70 grant bolier?

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i have a grant 70v3, ?

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grant euroflame 50- 70 bleed screw?

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do you do a grant 50 - 70 euroflame flue kit?

what screw do i undo to bleed a 50/70 grant bolier?

grant euroflame 50-90 bleed screw?

Grant Gemini euroflame 50-90 wont ignite?