Tobacco & Accessories › Dr Perl Junior 9mm Pipe Filters (40) Image 1 of 3 Image 2 of 3 Image 3 of 3 Dr Perl Junior 9mm Pipe Filters (40) £5.99 Universal 9mm diameter fits any standard filter pipe. Reversible design means there is no wrong way to insert the filter. Get notified by email when this product is in stock. Add To Cart Added! Universal 9mm diameter fits any standard filter pipe. Reversible design means there is no wrong way to insert the filter. Reviews Reviewer Name Review Date Star Rating Description Posted on Etsy Product Show More