a very usefull set of orings  include

4 pieces 14 * 1 mm silicone for tank pmma in the to of refill

1 piece   11 * 1 mm mbr first o ring on the base

1 piece   13 * 1 mm viton second o ring on the base

1 piece     9 * 1 mm silicone fit on chimney

1 piece   13 * 1 mm mbr for pmma on threads 

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