I would like to commend Julia and the folks at Grav for being so diligent in finding a down stem for My Grav ash catcher. Julia worked with me to find a replacement. She asked me for the measurements that I needed. Since Grav pieces are hand made, there might be a slight difference in pieces of the same design. Long story short, Julia found me the correct piece. I had it in my hands three days later with a very nice extra gift inside. Julia, thank you for that. My Grav bong and ash catcher filters the Essence of the Gardend through water three times. It is easy to clean as it is all polished. Great stuff. Thanks again Julia.