Buy one brew head and get not only our Bottomless 2-in-1 Portafilter but the Pressure Gauge Kit and an additional stainless steel dispersion screen as well. Not compatible with the Signature PRO.REQUIRES updated portafilter base. Sold separately. Only those who purchased a non-Signature Flair before November, 2017 would need to upgrade. Please see image to check which portafilter base you have.