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M2104.4 Polyethylene/Aluminum/Polyethylene (PE-AL-PE) Pressure Pipe
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Where compression-type fittings include inserts and ferrules or O-rings, the fittings shall be installed without omitting such inserts and ferrules or O-rings.
Solder joints in a metal pipe shall not occur within 18 inches (457 mm) of a transition from such metal pipe to PE-AL-PE pipe.