IAPMO IGC 269-2019涵盖了用于地下管道系统的非屏蔽柔性过渡管接头的PVC或ABS盖，并规定了材料、物理特性、性能测试和标记的要求。

IAPMO IGC 269-2019 covers PVC or ABS covers for use with unshielded flexible transition couplings for underground piping systems, and specifies requirements for materials, physical characteristics, performance testing, and markings.