... Gr1,Gr2,Gr7 3)Standard ASTM B338 4) Confortable pressure Coil heat exchangerCoil heat exchanger Material:Gr1,Gr2,Gr7 under ASTM ... Size: Custom size available SGS Test Report,ISO 9001:20001> Coil heat exchangerItem nameCoil heat exchangerMaterialTi tube in Gr1,Gr2,Gr7SizeCustom ...