1) heating air valve, 2) High accuracy 3) CNC machining heating air valveSIZE: 3/8", 1/2", 3/4"Material: A variety of copper As factory, we specialize in this field for several years, with good quality and pretty competitive price.Send us the drawings or samples if you have any interests. We can customize the samples and quote the best price for your approval ISO9001-2008 and TUV certificate