captivated coupling

English to Polish Tech/Engineering Electronics / Elect Eng dławnice kablowe

Ten sam fragment tekstu:

"The XX range of cable glands are intended to terminate circular braided or unarmoured cables into enclosures without compromising the explosion protection provided by the enclosures in accordance with relevant codes of practice. They consist of a male-threaded front entry component, a seal actuation nut and either an outer CAPTIVATED or running coupling."

Rozumiem, że ;"running coupling" to "sprzęgło swobodne" (Correct me if I'm wrong!!!).

A captivated coupling?... Pochwycone? Niewolne? Nieswobodne?

TIA,

Rafał