13W3 adapters

[Don]

Hi,

I need to make a 13W3 "extension cord" -- M-F *not* the
M-M (or F-F, depending on how you look at it!) cables that
Sun offered.

I salvaged a sufficiently long video cable off of a
<mumblemumble> Sun monitor -- so that gives me *one* end
(and, one *sex*).  The *other* sex is a bit more elusive
(i.e. the gender that is present *on* the actual CPU).

But, I found a <random> 13W3<->3BNC adapter in one of my
goodie boxes.  The 13W3 connector is "just right" (sex,
form factor, mounting, etc.).

So, the issue (and hence the question!) is:  what sort of
device might *want* this adapter (i.e. why should I *keep*
it and not just salvage parts from it)?  Note that the
BNC pigtails are only a few inches long so I assume this
would be attached to a 3BNC monitor and a "regular" Sun
cable used to tether that to the CPU.

Thanks!
--don