Comparison : Item # 1317-69-600, 1/8" FPT Union Malleable Iron Black Class 300
Item # 1317-69-601, 1/4" FPT Union Malleable Iron Black Class 300
Item # 1317-69-602, 3/8" FPT Union Malleable Iron Black Class 300
Item # 1317-69-603, 1/2" FPT Union Malleable Iron Black Class 300
Item # 1317-69-604, 3/4" FPT Union Malleable Iron Black Class 300