Standard 3/8" Triple Portafilter Spout
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3/8" female threads on to the bottom of the portafilter body. Many times the thickness of chrome on either this spout or the threads on the portafilter (or both), varies, and getting the spout to thread on may require more than one attempt. If it will not install far enough, a wrench and a very strong pull should position it over. If it threads on too far PTFE plumbers tape or a gasket may be required.