1.Material: stainless steel, carbon steel 2.Size:1/4"--4" 3.Certificate: ISO9001:2008. 4 ... Process: casting--machining--cleaning--quality control--packing9. Test: Tensile strength, yield point, elongation, hydrostatic test, chemical composition10. Function:filtration11. Packing: inner ... tee, cross, nipple19. Attend fair: China Import and Export Exhibition Stainless steel gas pipe union(ISO9001:2008)