... ,flame-retardand and thermal insulation layer,and protection cover with coupling patent design,patent number: ZL 00214874.9Property:Under temperature of ... .PMPaMin Bending Radius mmCoupling Thread 3/4 191421240NPT1,R13/4 192131.5240NPT1,R13/4 193552.5280NPT1,R13/4 194567.5280NPT1,R11 251421300NPT1,R11 252131 ...