Did you buy a pipe that takes a 9 mm filter and decided you didn't like using the filters? Did you find that the pipe had problems with moisture or gurgling when smoked without the filter? The we have the solution - the Stanwell Filter Adapter. All you have to do is insert this device into the filter chamber in the tenon and it steps down the airway to match the drilling, so now, no filter, no problem. When you use the Stanwell Filter Adapter, it's just like an unfiltered pipe!