Pipe Tools & Supplies - Adapter 9mm to 3mm Reducer
Does its job
These fitments are perfect for reducing the draw of a pipe designed for a 9mm filter. I have used them in numerous pipes I bought from the Continent and they fit all of them. I see a number of unhappy reviews, which I have to guess are from people who tried to use them in non-9mm pipes, as they easily fit all the ones I have. Perfectly adequate product that does its job.