Evenheat Kilns Type-K Thermocouple, 14 Gauge, 4" long from tip to block, includes four 1" x 1/2" cylindrical insulators and connection block as shown.
 
Suits Evenheat Models;
Artisan 688
KH 414, KH 418
KF 13.5, KF 18, KF 22.5, KF 27, KF 31.5, KF 36, KF 40.5, KF 45, KF 49.5
LB 18, LB 22.5, LB 27
KO 13.5, KO 18, KO 22.5, KO 27
HT-1, HT-2 (HT-27)
 
Note; Your kiln may or may not have its original thermocouple, particularly if it were purchased used or replacements were made with incorrect or non-Evenheat parts.