a very usefull set of orings  include

2 pieces 15 * 1 mm viton brown for tank pmma in the top of refill

1 piece   12 * 1 mm viton green first o ring on the base

1 piece   11 * 1 mm mbr black  second (bottom) o ring on the base

1 piece     9 * 1 mm silicone fit on chimney

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