Grouphead Insert for P-44 Tube made of Stainless Steel by a local machinist here in Oregon. Older models DO NOT have this insert as the tube screws directly into the back of the grouphead. Fits: Europiccola and Professionale Millennium Models, as well as some late-90s Pre-Millennium machines. Just as in the Plastic version (MP-1), the center hole is threaded all the way through. The differences that the plastic will grab and hold the tube as threaded in, the s/s will not. Therefore, the tube (p-44) will not stop at dead center, for correct positioning, food-safe, high heat thread sealer or Teflon tape is required. You can see the options we offer here. Note that we now offer a tool to help remove this insert. It is made locally here in Oregon as well and modeled after the Pavoni original.