Reducing Tee, Tube Fitting Material Wrot Copper, Fitting Connection Type C x C x C, Tube Size 3/8 in x 3/8 in x 5/16 in, Outside Dia. 1/2 in x 1/2 in x 7/16 in, Max. Pressure 623 psi@200 Degrees F, Temp. Range -20 Degrees to 400 Degrees F, Standards ASTM B75 Alloy C12200; Third-party Certified To NSF/ANSI 61 Annex G; ASME B16.22; MSS SP-104; MSS SP-109 (5 in To 8 in); NFPA 99 Health Care Facilities Gas And Vacuum Systems And The Compressed Gas Association, Pamphlet G4.1 (Medical Gas)