Bottom seals

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BR 1918
surface colour: silver anodized (C-0)
BR 3406
surface colour: silver anodized (C-0)
BS 4006 S
surface colour: silver | sealing profile colour: grey
BS 4006 V
surface: anodised | surface colour: silver anodized (C-0)
BS 4807 S
surface colour: silver | sealing profile colour: grey