Hello Nick, For your TL4000 what you will need is any LTO cleaning tape.  All LTO cleaning tapes are the same & can clean any LTO drive from an LTO1 to LTO5.  So if you see one that says an LTO cleaning media then it will work in your LTO5 TL4000.   Please let us know if you have any other questions.
Hello, We have a TL4000 with LTO5 drives. I'm in need of a cleaning tape and won't be able to wait until Dell can ship it out to us. I have been looking at some tapes available on another site which I'll be able to get on Monday and was wondering if I need to find a universal cleaning tape that says LTO 5 or will any of them work (as long as they have a chip for counting the cleaning cycles)? I am not sure if it is just an outdated photo but most only say up to LTO4.   Thanks, Nick
TL4000 LTO5 cleaning tape