[Resolved] Hose barb specs on autopot fittings and adapters To Parent Forum January 22, 2021 at 3:28 pm #729 cyaniwParticipant Hi, Are all barb sizings represented by ID or OD or of tubing to be used? I would like to connect the flexitank tap to the 16mm profilter and reduce that to 3/8″OD x 1/4″ID tubing that I already have. Thanks in advance. January 22, 2021 at 3:30 pm #746 JoshKeymaster All our barb fittings are OD … if you want to easily reduce down you can view a fitting that we have please see link https://www.autopot.co.uk/all-products/fittings/16mm-fittings/16-9mm-or-16-6mm-in-line-filter/ You must be logged in to reply to this topic.