Comparison : Item # 1031-1927-61-08-08, 1/2"-14 FPT x 1/2" Tube O.D. Flange Steel FP-Flange O-Ring Face Flange
Item # 1031-1927-61-08-08-K, 1/2"-14 FPT x 1/2" Tube O.D. Flange Steel FP-Flange O-Ring Face Flange
Item # 1031-1927-61-12-12, 3/4"-14 FPT x 3/4" Tube O.D. Flange Steel FP-Flange O-Ring Face Flange
Item # 1031-1927-61-12-12-K, 3/4"-14 FPT x 3/4" Tube O.D. Flange Steel FP-Flange O-Ring Face Flange
Item # 1031-1927-61-16-16, 1"-11-1/2 FPT x 1" Tube O.D. Flange Steel FP-Flange O-Ring Face Flange