FWS RFM 18HX12C Thermocouple Pipe Well 12"x 18" Steel Pipe 90° Elbow 3/4"NPT

New old stock, has some rust from storage.
FWS Dual Element Thermocouple.
1"x 12" Vertical Pipe dia with 18" elbow pipe 1-3/4" Dia.
 3/4" NPT thread size.