Zdá se, že "oil stop" a "oil barrier" se používají zaměnitelně.

http://macproducts.net/catalogs/copper catalog0002.pdf

Type MRCP long barrel compression coupler with oil
seal barrier is available in cable sizes ranging from #6
Str. to 1000 MCM. A pure copper oil stop barrier is
brazed in the center of the connector barrel, assuring a
positive seal between cables. Fabricated of pure, seamless
copper tubing and tin plated for corrosion resistance.

http://www.nexans-power-accessories.com/fileadmin/GPH_CZ/Pri...