Classic Mini Fuel Pressure Regulator.

Just had it in my shed, never used it as I’m using carburettors, brand new in box still

This is the malpassi version of the Facet one they sell now, see the link below.

https://www.minisport.com/facvk384mgf1h-facet-mpi-power-boost-valve-fuel-pressure-regulator-1997-01.html