The minimum rough-in height is 4-1/2", and the maximum is 9-1/2". However, by using either the -X3 or -X4 Static Foot Extension, the minimum and maximum rough-in height of the system can be increased by an additional 3 or 4 inches respectively.
The standard coupling is made from ABS plastic. Also, a corrosion resistant cast iron coupling can also be specified by selecting the -CC option.
Yes, Zurn offers the Z1203-N style carrier for 3" connection - the NL3, NR3, and ND3. See the following spec sheets for details: http://zurn.eriepa.us/specdrain/Product/Options/57112.pdf &http://zurn.eriepa.us/specdrain/Product/Options/57113.pdf