La Pavoni Europiccola & Professionale Safety Valve New 2023 Chromed upper cup (with brass body) We can finally say that Pavoni (or the new ownership) is making some very welcome changes, including this new safety valve assembly that will replace the MP-39 and MP-40. M12 thread size NOTE: This valve requires a 17mm socket or open wrench, it can be reached from the upper area without going inside the drain cap. However, once installed, a thin-walled socket is needed to reach inside the drain cap to remove if/when needed.