Welcome to the Wilson and Cousins support page. This is where you can find further information about products including worksheets and Excel-based calculators for custom valve orders.
Please note that “XSLM” files are Microsoft Excel Macro-enabled Spreadsheets. They must be downloaded as ZIP archives and then uncompressed on your computer for security purposes. You may have to temporarily disable antivirus software when unpacking the ZIP files, depending on your settings.