Comparison : Item # 1317-64-500, 1/4" MPT x 1/8" FPT Hex Bushing Malleable Iron Galvanized Class 150
Item # 1317-64-501, 3/8" MPT x 1/8" FPT Hex Bushing Malleable Iron Galvanized Class 150
Item # 1317-64-502, 3/8" MPT x 1/4" FPT Hex Bushing Malleable Iron Galvanized Class 150
Item # 1317-64-503, 1/2" MPT x 1/8" FPT Hex Bushing Malleable Iron Galvanized Class 150
Item # 1317-64-504, 1/2" MPT x 1/4" FPT Hex Bushing Malleable Iron Galvanized Class 150