N scale track #7512

[VA Tumbleweed]

I recently acquired a box of various N-scale train & track. I've identified  all but one piece...#7512. I beleive it may be an uncoupler, but would like to know for sure. Any info about when it was sold, price, etc. would be greatly appreciated!  Thanks!                                 VA Tumbleweed
P.S. Can send -photo if desired.