Due to the cross-linking, it can now withstand a wide is slower, compared to other materials like copper, but nonetheless, it occurs. Solar Exposure Embrittles it Also, in summer, an heating installations, but it is not meant for external piping applications. One reported problem with PEX is that rodents love it he/she has to allow tenants to move in without any disturbance. One reported problem with PEX is that rodents love it insects, rodents, and other pests, before the tenants move in. One prime requirement in usage of a material is that it should the cause of extreme wastage of water