Clicking the download button brings up the menu for Uni-Bell's design software, "External Load Design for Flexible Conduits."  The software doesn't apply exclusively to PVC.  It may be used for calculating the long-term deflections of any flexible pipe material.

Uni-Bell Software Download Instructions:

Please follow these instructions to download and install the software on your local system.  The file size of UniBell_LoadDesign.zip is 2.2 MB.  Estimated time to download with a 56k modem is 2 minutes.

1. Complete the download to a folder you can access on your local system.
2. After completion of the download, locate the file UniBell_LoadDesign.zip on your local system.
3. The UniBell_LoadDesign.zip file is a zip file.  Upon double-clicking the file, it will open to show 3 individual files.  You may want to move the file to an individual folder before extracting the files.
4. After double-clicking on the UniBell_LoadDesign.zip, click on the button marked “Extract”.  You will be prompted for the destination folder to extract the 3 files contained in UniBell_LoadDesign.zip.
5. After selecting a destination, click “Extract”.  The 3 files will be extracted to the destination that you selected.
6. Exit from the UniBell_LoadDesign.zip file.
7. Locate the files extracted on your local drive using Windows Explorer.
8. Double-click on setup.exe to start the installation of the software on your local system. 
9. Click ok, then click on the computer icon and click on ok.