A Anti vacuum valve is used to prevent that the pressure switch is kicked in too early when heating up. This anti vacuum valve has a male screw thread of 1⁄4/" BSP. A anti vacuum valve exists out of multiple components. The body with the threads, in this case made from stainless steel. The plunger, made from brass. This plunger has also the gasket on it, this is a FKM gasket. These gaskets are not sold individually. If you have a leaky gasket on your anti vacuum valve, just replace the entire valve.

This specific anti vacuum valve can be used on a variety of espresso machine brands like: Victoria Arduino, San Remo, San Marco, Vibiemme, La Spaziale, Nuova Simonelli and La Pavoni