6002 Series Reducing Bushing, Tube Size: 3 X 2 IN, End Connection: Fitting X Copper, Material Specification: ASTM B75 Alloy C12200 Wrot Copper, 317 PSI At 100 DEG F, -20 To 400 DEG F, Outer Diameter: 3-1/8 X 2-1/8 IN, Dimension B: 2-9/16 IN, Third-Party Certified To NSF/ANSI 61 Annex G, ASME B16.22, MSS SP-104, MSS SP-109 (5 to 8), NFPA 99 Health Care Facilities Gas And Vacuum Systems And The Compressed Gas Association, Pamphlet G4.1 (Medical Gas)