Unbranded Ceramic Thermowell 6685362011, 02101395 0001, 21" end to end (overall) length, ceramic well OD is 7/8", ID is 5/8", Label is marked 6685362011, 02101395 0001 Thermowell See DRW CLS Tab Note Button AX=7/. Threaded connection is 1" MNPT. Not sure of part number am using number from packaging label as part number. Please purchase accordingly.