Sioux Chief offers all major PEX systems. Sioux Chief's PEX offering is the most complete in the plumbing industry. All fitting and tubing solutions carry a 25-year warranty, mixed or matched. Sioux Chief does not limit its warranty on tube or fittings based on matching system connections. This is unique. PowerPEX is warranted across all three of Sioux Chief's PEX system connection offerings, giving contractors the ability to choose the right tube or fitting connection for each application, layout or contractor comfort level. We call this Fitting Freedom™.