Here's the dilemma- you really like a certain pipe, but it takes a European-style 9mm filter, and you don't like filtered pipes. Your only options are to buy it and use the filters, buy it and smoke it without the filters (which may result in a wet smoke), or not buy the pipe, as much as you like it. You now have another, affordable option. With this 9mm to 3mm adapter, the problem is solved. Just slip this piece in place of the filter, and it will smoke as if it's a non-filtered pipe, and they're inexpensive enough to by one for every 9mm pipe you own. That's a heckuva lot cheaper than having a non-filtered stem made!