... .Factory price 1.We insist on using CONSTAB PEX-b material,the best material in the world ... 2.With WATERMARK,AENOR,EME,ISO certificates verify,PEX AL PEX pipe is widely used for underfloor heating.T ... perfect quality control management system.4.Butt-welded PEX AL PEX pipe is made of 5layers,both inner and ... outer layers are pex,Aluminium in the middle,and two layers of glues ...