I recently purchased a smooth slightly bent 121KS shape with a wonderful flame grain. However the pipes are all listed as no filter pipes. It turns out, they are actually standard Savinelli 6mm designs fitted with a filter replacement piece. I have another Savinelli where I fitted the pipe in this way. I find this makes using pipe cleaner while smoking nearly impossible. I realize that if I just broke down and stuck in a balsa or carbon filter, the need for a sopping up is very rare. And I don’t smoke particularly wet, but sometimes a cleaner is needed. Oh well… I feel a little duped.