decompress valve 1.material:brass 2.specification:1/4*1/4  decompress valve1.The model in our factory is DT-15.2.The main material is brass.3. four types:1/4*1/4;3/8*3/8;3/4*3/44.the pressure is according to your require.we often make it with 3-4kg.5.one pcs per...