... 3.color:any color PE-RT female thread coupling for heating system1.material:PERT(LG)2.size:s16,s20,*1/2 ... Non-toxic, no heavy metal additives,would not be covered with dirt or contaminated by bacterium Corrosion Resistant, resist chemical matters ... conditions Recycled and Environment friendlyApplication: 1. Ground heating system, it is suitable for such heating as the living room, bedroom, public ...