It is used in pumps with piston diameter 1/8" as a washing head seal. It is made from material GFP.
As working head seal is used a seal made from U-R320HB(CC)-06-GFP-HST (P/N 00507000) or U-R320HB(CC)-06-UP40-HST (P/N 00504000).
By seal changing must the spring directed out of unit.
For pump types ECP2010, ECP2011, ECP2011P, ECP2011S, ECP2011SP, Alpha 10, Beta 10, VRS 15, 4020.3 and 4020.5.