CMA 1/4 x 3/8" Check Valve la-marzocco-strada-mp/strada-mp-portafilter-assembly and this one won't thread

and this one won't thread into it correctly

4 holes x 1

Rancilio Rocky Removable Grounds Tray

External diameter: 57 mm

CMA 1/4 x 3/8" Check Valve la-marzocco-strada-mp/strada-mp-portafilter-assembly and this one won't threadCMA 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