Comparison : Item # 1317-44-500, 1/4" MPT x 1/8" FPT Hex Bushing Bronze
Item # 1317-44-501, 3/8" MPT x 1/8" FPT Hex Bushing Bronze
Item # 1317-44-502, 3/8" MPT x 1/4" FPT Hex Bushing Bronze
Item # 1317-44-503, 1/2" MPT x 1/8" FPT Hex Bushing Bronze
Item # 1317-44-504, 1/2" MPT x 1/4" FPT Hex Bushing Bronze