PEX (cross linked polyethylene) is material used in building entities for water supply systems. It is tested and accepted by many users to be the most advanced material that is available in the market for building water supply systems as well as accessories. It is gaining popularity because it is considerably easier to install than its other counterparts. Also, the durability of PEX tubes and systems is very large, since it is resistant to majority of the factors that cause degradation in the pipe. PEX tubing is used to distribute heat through water in radiant and Hydronic water systems. It is due to these heating systems that the PEX tubing systems are highly insulated. Most of the heating systems need PEX tubing with an oxygen barrier. The oxygen barrier is used so that oxygen doesn’t escape from the tubes. Further, if the oxygen barriers are not used and the material used in the tubing systems are iron/ferrous, then there is high probability that the tubes will form rust over a period of time. They basically fall under the category PEX crimping tools, sometimes also called as PEX extensions. PEX is used in variety of places like domestic water piping, insulation for high-tension electrical cables, natural gas and offshore oil applications, chemical transportation, transportation of sewage and slurries. Now after it advantages are widely recognized, the PEX has become an alternative for PVC and other copper pipe systems that are used domestically as well as otherwise.