PEX pipe is made of cross-linked polyethylene, The working temperature of PEX pipe is up to 95°C, and the working pressure is 1.0 Mpa. The size of it is from 14*2.0 mm to 32*3.0 mm. RIFENG Company provides two kinds of PEX pipe. One is with oxygen barrier layer (EVOH layer), and the other is without oxygen barrier layer. The colour of it is natural. Rifeng PEX pipe has got the following certifications: SKZ from Germany; NSF, IAMPO from the Unit State.