Melampous Harpoon EFS set orings

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...