Standard specification for flexible transition couplings for underground piping systems 地下管道系统用柔性过渡管联接器的标准规范
2.
Standard specification for shielded transition couplings for use with dissimilar dwv pipe and fittings above ground 地上用不同dwv管和配件用屏蔽转换联结器的标准规范
3.
Standard specification for shielded transition couplings using flexible poly vinyl chloride gaskets to connect dissimilar dwv pipe and fittings 用柔性聚氯乙烯衬垫连接不同dwv管和管配件的屏蔽转换联结器的标准规范