This is the Distance Disc for Becker U Series pumps (Part #91147200000) . It is a component that maintains proper spacing inside your vacuum pump . This disc is used on many Becker U Series pump models including U4.165, U4.190, and U4.250

Becker vacuum pump sealed properly with this sealing ring. Made for U4.165, U4.165E, U4.165F, U4.190, U4.190E, U4.250, and U4.250E pumps. This ring is also known as a “Sealing Ring/Bearing” .It creates a tight seal between internal pump components. OEM quality direct replacement.

Sealing ring is used on pump models U4.165E, U4.165F, U4.165, U4.190E, U4.190F, U4.190, U4.250E, U4.250F, U4.250

This is the Copper Sealing Ring for Becker U Series pumps (Part #94802910000) . It is a vacstellar-engineered copper ring that creates a tight, reliable seal inside your vacuum pump . This sealing ring is used on many Becker U Series pump models including U4.165, U4.190, and U4.250