... flange,PP-R elbow,PP-R tee... PPR pipe fitting, also called random copolymerized polypropylene(type 111)tubes, are a new generatiPPR ... resistance, anti-deposition and long service life, PP-R tubes also enjoy some other advantages ,like hygienicness, heat-resistance and ... longer service life. Meanwhile, their coefficient of heat conductivity is quite low and they are good at heat preservation and ...