No need to buy those long pipes that you only use once in a blue moon; now you can combine your regular pipe clamps and get extra-long lengths! Just insert it into the ends of two pipes and tighten down. Special ribbed jaws firmly grip the inside of the pipe, so there’s no need for threads. The tailpiece assembly slides right over the extender onto the other pipe. When you're done, the extender can be removed in seconds! Since your normal clamps serve double-duty, it’s a great way to save money and shop space. Fits 3/4" zinc pipe.