malleable cast iron pipe fitting

例句：

1. 1. The new valve fittings are designed to fit seamlessly into the existing pipeline system.
   新的阀门接头设计得可以无缝地适配现有的管道系统。
2. 2. The engineers were tasked with installing these malleable cast iron pipe fittings in the construction site.
   工程师们被指派在工地安装这些可锻铸铁管件。
3. 3. The malleable cast iron pipe fittings ensure a smooth flow of water, preventing leaks and ensuringefficient operation.
   可锻铸铁管件确保水流顺畅，防止泄漏并保证高效运行。