The 1780140 Support Ring is a precision sealing support component used in high-pressure pump systems, especially in Annovi Reverberi (AR) pressure washer pumps. It is installed along with seals and O-rings to support sealing elements and prevent extrusion under high pressure, ensuring proper sealing and long service life of the pump. This ring is commonly found inside triplex plunger pumps used in pressure washers and industrial cleaning equipment.