Backing Ring For Ctrb Class 'E' 6'' X 11''(Narrow Jaw) Drg.No. Drg.No.- Wd-92089-S-01 Alt-1,Item No.-9 Drg.No.- Wd-92089-S-01 Alt-1,Item No.-9 Spec.No.Ab/Rb-39-2002 (Rev.4)(Non V Ented),Make-Nbc, Accepted, Backing Ring For Ctrb 6'' X 11'' Class 'E' To Nei Drg.No.Pesd-608 5 Narrow Rev D Or Latest Part No. 9, Make : Nbc. [ Warranty Period: 30 Months After The Date Of Delivery ] ]