Comparison : Item # SF075050S, 3/4 x 1/2 Inch (in) Size Steel NPT Reducing/Increasing Combination Nipple
Item # SF075100S, 3/4 x 1 Inch (in) Size Steel NPT Reducing/Increasing Combination Nipple
Item # SF100075S, 1 x 3/4 Inch (in) Size Steel NPT Reducing/Increasing Combination Nipple
Item # SF100125S, 1 x 1 1/4 Inch (in) Size Steel NPT Reducing/Increasing Combination Nipple
Item # SF125100S, 1 1/4 x 1 Inch (in) Size Steel NPT Reducing/Increasing Combination Nipple