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Materials (Materials), static (Stationary Ring): U2,Q2,V1,Q11 rings (Rotary Ring): B,A,Q1,,Q2 Secondary seal (Secondrary Seal): the V,P,E springs and structures (Spring and Metal Parts): F,G,S suitable medium: water, oil and Applications:Clean water,sewage water,oil and ohter moderately corrosive liquids corrosive fluids