Wiktionary
end cap
n. 1 A display of goods for sale situated at an end of an aisle in a shop, perpendicular to the goods in the aisle. 2 Any of various capping devices that fit over the end of something, either as protection or to prevent loss of contents. 3 # A piece of packaging insulation that surrounds one side of an object.
Usage examples of "end cap".
She fit rubber pads on the vise jaws so that the pipe wouldn't be marred, then used a special wrench with a rubber mouth to unscrew the end cap.
It will take you to a rendezvous point near the end cap where we can tow you in.
Workmen had recently removed the end cap of the big electric drive motor.
Cashel said, checking first one, then the other end cap of the quarterstaff.