What are the advantages of pressfitting systems vis à vis the traditional junction systems (threaded, brazed, welded, etc.)?

Compared with the traditional junction systems, the pressfitting systems are installed more rapidly, thereby saving considerable assembly time: they are simpler and more convenient, requiring only compliance with the correct installation techniques, while ensuring proper seal. 
Pressfittings
Pressfittings

The most effective and efficient way to make an installation

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