Ascaso Fixed Filter Piston Compression Chamber Lid ca Run the original fixing nut

Run the original fixing nut all the way onto the old tee

reusing a compressed old gasket is the number one cause of a weep leak after a "successful" element swap

It controls boiler pressure by cycling the heating element on and off within the set pressure range

Left side (as facing machine)

Ascaso Fixed Filter Piston Compression Chamber Lid ca Run the original fixing nutAscaso Fixed Filter (F. F.) Piston Compression Chamber Lid Compression chamber lid used only in Ascaso's rare Fixed Filter thermoblock models, look for an "F. F." suffix on your machine's model sticker before ordering. This is a special order item, typically requiring 4 6 weeks for processing prior to shipping. COMPATIBILITY Fits: Ascaso Bar FF, Basic FF, and Dream FF (Fixed Filter thermoblock models only, marked "F. F." on the model sticker)