The Standard Brew Head comes with The NEO, Classic and Signature models and can accept the Flow-Control Portafilter, as on the NEO or the Bottomless 2-in-1 Portafilter, as on the Classic and Signature. (The Flow-Control 2 Portafilter is easy to recognize with its red color.)
This brew head is smaller, and has less stainless steel than the PRO 2 Brew Head, with a 60ml reservoir and a dose range of 12-18 grams. The yield from the Standard Brew Head is roughly 45ml, or less than a volumetric double shot. However, the Standard Brew Head still has the capability to produce cafe-quality shots, just like the PRO 2.
Parts of the Standard and PRO 2 Brew Heads are not interchangeable.
Click to learn more on The NEO, The Classic or The Signature