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Multiple Choice

Unions are a common threaded connection used in low pressure applications.

Unions are fitted as quick-disconnect threaded connections that join two pipe ends with a nut and gasket, letting you disassemble the joint easily for maintenance without cutting or reworking the piping. This design is well suited to low-pressure systems where you want serviceability and straightforward sealing with a gasket or o-ring. While they can be used in higher-pressure systems if designed for it, their ubiquity in low-pressure piping comes from the simple, reliable seal and easy disassembly they provide. So the statement is true.

Unions are fitted as quick-disconnect threaded connections that join two pipe ends with a nut and gasket, letting you disassemble the joint easily for maintenance without cutting or reworking the piping. This design is well suited to low-pressure systems where you want serviceability and straightforward sealing with a gasket or o-ring. While they can be used in higher-pressure systems if designed for it, their ubiquity in low-pressure piping comes from the simple, reliable seal and easy disassembly they provide. So the statement is true.