Fluid-o-tech Relief Valve/By-pass Valve Brand_Gaggia this may be one of

this may be one of the last chances to get an original rather than a fabricated substitute

this clip-on version isn't a direct swap

54mm OD x 31mm ID x 8mm thick

so basic mechanical aptitude or a technician is recommended

Fluid-o-tech Relief Valve/By-pass Valve Brand_Gaggia this may be one ofFluid o Tech Relief Valve By pass Valve This Fluid o Tech by pass valve protects the hydraulic system from over pressurization, opening to drain excess water when pressure builds too high. It can also be used to fine tune pump dispensing pressure. SPECIFICATIONS Fitting: 1 8" female BSP Seal: NBR Manufacturer part #: B2E COMPATIBILITY Fits: Fluid o Tech pumps using an M12 x 1. 0 mm female fitting to connect to the pump piston Exceptions: Ascaso pumps