Orifice Holder - 15K, Nat SVCE (SRT,DF,CT,GR)
   NOTE:  FOR FRENCH TOP SEE 802250
   SRT    Use Regardless of Serial Number.
   DF/CT  Use Starting With Serial #17000000 and
          Between Serial #16050607 And #16050686
          Prior to Serial #17000000 Except Between
          Serial#16050607 And #16050686 See 816484
   CT15G  Uses 12K Burner See 808002