... Solar collector 1.Reliable and efficient twin-glass solar tubes2.Copper heat pipes for repid heat transfer3.Easy plug in ... 1.8mm,Insulating layer,compressed rock woolHeat Pipe pure red copper TU1+water,transfer power>=150W,Working pressure,4Mpa,welding pressure ... 390.5Container Loading Quantity(set)20102787763574022116916613613040HQ278213209172171Price(USD) Solar collector project floor heating