604 Series adapter, Tube Size: 2 IN, Pipe Size: 2 IN, End Connection: Copper X MNPT, Material Specification: ASTM B75 Alloy C12200 Wrot Copper, 364 PSI At 100 DEG F, -20 To 400 DEG F, Outer Diameter: 2-1/8 X 2 IN, Dimension B: 1-3/32 IN, Third-Party Certified To NSF/ANSI 61 Annex G, ASME B16.22, MSS SP-104, NFPA 99 Health Care Facilities Gas And Vacuum Systems And The Compressed Gas Association, Pamphlet G4.1 (Medical Gas)