CMA 1/4 x 3/8" Check Valve barista-basics/knockboxes but a technician is a

but a technician is a safe choice if you're unfamiliar with the group internals

Works with: 80 SH gasket (AS_38) and round copper washer (AS_81)

and seal sizes differ

Works with: La Marzocco rubber feet and their mounting bolts

CMA 1/4 x 3/8" Check Valve barista-basics/knockboxes but a technician is aCMA 1 4 x 3 8" Check Valve This check valve, made of low lead content brass (CW510L OT57), releases at 12 bar, water flows in toward the internal gasket. It's now fairly rare, since CMA has moved to three way combination expansion valve check valve assemblies. A less common 3 8" x 3 8" version is also available (AS_232). SPECIFICATIONS Material: Low lead brass (CW510L OT57) Pressure Range: Releases at 12 bar COMPATIBILITY Fits: CMA machines using this