The SRVRTRAIL23 Mounting Rail Kit allows standard 19" wide rackmounting capabilities to be converted into 23" wide rackmounting capabilities, typically seen in TelCo applications. This kit works with the 42U Wide Racks (SR42UBWD, SR42UBWDSP1, SR42UBWDTAA, SR42UBDPWD and SR42UBWDVRT). SRVRTRAIL23 coems with a limited 5-year product warranty.