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Cross-linked polyethylene, commonly abbreviated PEX or XLPE, is a form of polyethylene with cross-links. PEX pipe is suitable for use with hot or cold water. With the proper adapters, PEX pipe can be used with steel, copper, PVC and CPVC plumbing pipe. PEX is the most flexible plumbing pipe available. It can be bent around most corners without a coupling or fitting. For example, 3/8" pipe may be bent to a 4" radius and 1/2" pipe to a 5" radius. PEX flexibility also allows it to expand and contract more than other types of pipe.Cross-linked polyethylene, commonly abbreviated PEX or XLPE, is a form of polyethylene with cross-links. PEX pipe is suitable for use with hot or cold water. PEX is manufactured and tested according to stringent national consensus standards: ASTM F 876, F 877, AWWA C904 and CSA B137.5. PEX is included in all of the major model plumbing codes used in the United States and Canada; NPC, UPC, IPC and NSPC, and approved by HUD for hot and cold potable water plumbing use. With the proper adapters, PEX pipe can be used with steel, copper, PVC and CPVC plumbing pipe. PEX is the most flexible plumbing pipe available. It can be bent around most corners without a coupling or fitting. For example, 3/8" pipe may be bent to a 4" radius and 1/2" pipe to a 5" radius. PEX flexibility also allows it to expand and contract more than other types of pipe. PEX 's flexibility and strength at temperatures ranging from below freezing up to 200 degrees Fahrenheit makes it an ideal piping material for hot and cold water plumbing systems, service lines, hydronic radiant heating systems, snow melting applications, ice rinks and refrigeration warehouses. Flexible systems are quieter than rigid piping. The smooth interior will not corrode which can affect other materials long term pipe flow characteristics. PEX is also very freeze- break resistant. PEX systems have fewer joints and are easier to install providing a lower cost installation over traditional plumbing materials. PEX is designed and tested to perform as well or better than any other material approved for hot and cold-water distribution systems. For indoor plumbing applications, PEX is expected to perform as long as copper, CPVC or any other approved plumbing distribution materials.