BS 5504-4:1990 pdf free.Wall hung WC pan - Part4:Specification for wall hung WC pans for use with 7.5 L maximum flush capacity cisterns. BS 5504-4 specifies material, quality, performance and functional dimensions (other than connecting dimensions) for wall hung washdown WC pans designed for use with independent or close-coupled cisterns complying with BS 7357 having a flush capacity of 7.5...