Comparison : Item # 1501-02-02, 1/8 Inch (in) NPTF Thread Size and 1/8 Inch (in) NPSM Thread Size Carbon Steel 90 Degree Male x Female Swivel Pipe Elbow
Item # 1501-02-04, 1/8 Inch (in) NPTF Thread Size and 1/4 Inch (in) NPSM Thread Size Carbon Steel 90 Degree Male x Female Swivel Pipe Elbow
Item # 1501-04-02, 1/4 Inch (in) NPTF Thread Size and 1/8 Inch (in) NPSM Thread Size Carbon Steel 90 Degree Male x Female Swivel Pipe Elbow
Item # 1501-04-04, 1/4 Inch (in) NPTF Thread Size and 1/4 Inch (in) NPSM Thread Size Carbon Steel 90 Degree Male x Female Swivel Pipe Elbow
Item # 1501-04-06, 1/4 Inch (in) NPTF Thread Size and 3/8 Inch (in) NPSM Thread Size Carbon Steel 90 Degree Male x Female Swivel Pipe Elbow