Wallyball nets come in several styles and widths. The standard width of a wallyball net is 36  inches. Now nets also come in a 30 inch width. These nets are NOT a replacement for the 36 inch net. They DO NOT tighten properly when used in a court drilled for a 36 inch net. New holes must be drilled. The "AUWP" net comes in a 30" width.
For instructions on how to setup a wallyball net, see www.wallyball-info.com/How_To_Setup_A_Wallyball_Net.html
American Wallyball Association
Generic  Wallyball Nets