This document covers the supplemental requirements for Enhanced Leak Resistance LTC (SC22) connections and the changes in API Spec 5CT, API Std 5B, API 5B1 and API RP 5C1 needed to produce and inspect these connections. By agreement between the purchaser and manufacturer, the supplemental requirements for SR22 shall apply to connections manufactured in acccordance with API Spec 5CT and may be marked with the API monogram.