provide a uniform load on the disc 54 the secondary seal consists of a first secondary seal ring 60 which comprises arcuate segments that are retained by a biasing means such as circular spring 62 ideally all of the elements except for the springs 62 in the secondary seal are split into two arcuate segments radial pressure provided by spring 62 on the outer diameter of the first secondary seal ring member 60 holds the arcuate segments together and retains the end sections of the arcuate segments of the secondary seal ring 60 in contact with each other the inner diameter 64 of the first secondary seal ring segment 60 is biased against the outer diameter 45 of the inner diameter portion 44 of the retainer thus the spring 62 provides an inward bias on the first secondary seal member 60 to provide a seal between the inner diameter 64 and the cylindrical surface 45 seal member 60 comprises an annular end wall 66 on which the disc 54 is biased and a second end wall 68 which is adjacent the second secondary seal ring referring now to fig1 and 3 the second secondary seal ring comprises two portions having different.