... are marked by it"s super temperature-resistance performance owing to the inside special molecule structure. Specification:Pipe: OD: 16,20 ... life of 50 years!2. quite fexible, be easy to fit 3. easy to bend, while solid, brittle fracture does not occur, can ... pipes, overpressure resistant, safe and reliable 4. light weight, easy to handling. pert fitting male tee