welded check valve 1.size:1/2"~8" 2.material:ss304,ss316,ss316L ... and ODM service 4.high quality,low price vertical welded water check valve 1.material: TP304/TP304L/TP316L/TP321 and so on ... .2.size:1/2"~8"3.media:gas, water,oil and ... ODM orders are also welcomed All the information above are for reference, if you want to know more of our products ...