Answer :
Final answer:
Connections between metallic and plastic piping outdoors or underground can be made with fittings conforming to ASTM or CSA standards, but can also be done according to manufacturer's recommendations or local codes.
Explanation:
Connections between metallic and plastic piping outdoors and underground can be made with fittings conforming to various standards, depending on specific requirements. Those standards may include ASTM standards or CSA standards. Both of these sets of standards offer guidelines for materials, design, and installation methods that ensure reliability and safety. ASTM standards are developed by the American Society for Testing and Materials, and are used globally. CSA standards are developed by the Canadian Standards Association and are most commonly used in North America. However, in some cases, connections may alternatively be made according to the Manufacturer's recommendations or local codes, which are typically based on the aforementioned standards, but can include additional guidelines or specifications.
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