Comparison : Item # 1317-65-600, 1/8" FPT Union Malleable Iron Black Class 150
Item # 1317-65-601, 1/4" FPT Union Malleable Iron Black Class 150
Item # 1317-65-602, 3/8" FPT Union Malleable Iron Black Class 150
Item # 1317-65-603, 1/2" FPT Union Malleable Iron Black Class 150
Item # 1317-65-604, 3/4" FPT Union Malleable Iron Black Class 150