... 63*10.5 etc. White,green PP-R PipeSize:1---S5 PN1.25Mpa: 25*2.3 , 32*3.0 , 40*3.7 , 50 ... *4.6 , 63*5.8 .2---S4 PN1.6 Mpa : 20*2 ... .3 , 25*2.8 , 32*3.6 , 40*4 ... *7.1 .3---S3.2 PN2.0Mpa: 20*2.8 , 25*3.5 , 32*4.4 , 40*5.5 , 50*6 ... normal palces for long time <700, could choose C=1.25 .If used long time for important places for long time ...