this seal is used in auto cooling pump, auto seal,RM FB, water pump seal, engine seal, pump seal, shaft seal,

this seal is named as RM FB, usually from 12mm to 20mm, especially RM FB-12M and RM FB-16M are most .popular in the market. RM FB-12M, Inner diameter is 12mm, the outside diameter is 30MM, FB-16M, The inner diameter is 16mm, the outside diameter is 36.60mm, usually in the outside there is blue glue paint ,some clients need this blue glue, some not.

Mechancial seals and automotive seals