These steel base flanges are available for 1-1/4" or 1-1/2" pipe.
Alloy: 1006 - 1010
This steel flange with four holes is for use with 1-1/4" pipe (OD 1.66")
Item Number : 1613
This steel flange with four holes is for use with 1-1/2" pipe (OD 1.90")
Item Number : 1623