Tube,Water,Ovrmld,SVCE (BI-36U,BI-36UG,BI-36S,
          BI-42UFD)
BI-36U/UG Use Starting With Serial #4116328
          Prior to #4116328 See 7010622 & 7010640
  BI-36S  Use Starting With Serial #4116328
          Prior to #4116328 See 7010620 & 7010640
 BI-42UFD Use Regardless Of Serial Number