Lightweight, low pressure, manufactured from selected resins and designed specifically for non-critical applications such as open-end drain line Use for farm/ranch water systems, electrical or cable TV conduit, construction, city service lines, sprinkler systems, skating rinks, air conditioning, submersible pumps, etc. Not to be exposed to direct sunlight for extended periods Not for use for compressed air systems Use with insert fittings and stainless steel clamps Working pressures based on PSI at 73.4 degrees Fahrenheit At higher temperatures, working pressure is less. 100 PSI maximum working pressure Black - not NSF approved