... coupling for heating pipe 1.material:PE-RT,LG 2.size:16*20,20*25,20*32,32*25 3. ... color:any color 4.Do OEM PE-RT reducing coupling for ... heating pipe 1.material:PE-RT,LG2.size:16*20,20*25 ... , swimming pool, kindergarten, nursery and the old people's house 2. cold and hot water supply system, drinking water system 3 ...