Comparison : Item # ST.50X.25RC, 1/2 x 1/4 Inch (in) Size Standard Steel Reducing Coupling
Item # ST.50X.375RC, 1/2 x 3/8 Inch (in) Size Standard Steel Reducing Coupling
Item # ST.75X.25RC, 3/4 x 1/4 Inch (in) Size Standard Steel Reducing Coupling
Item # ST.75X.375RC, 3/4 x 3/8 Inch (in) Size Standard Steel Reducing Coupling
Item # ST.75X.50RC, 3/4 x 1/2 Inch (in) Size Standard Steel Reducing Coupling