Pipeline coupling , • having a first coupling element referred to as a fixed part , which has a pipe connector , • and a second coupling element, which can be selectively connected to the fixed part and is referred to as a movable part , and which likewise has a pipe connector , • wherein the two coupling elements have interacting holding elements, such that the movable part is selectively held in a holding position on the fixed part and the two pipe connectors together form a pipeline portion, • and wherein the two coupling elements have interacting sealing surfaces , such that the movable part bears against the fixed part in a media-tight manner in the holding position, • and having a stop limiting the relative movement between the fixed part and movable part transversely to the central axis of the pipeline portion, • and wherein the movable part has a handling connection , which is intended to provide a selectively releasable connection to a handle that holds and guides the movable part , • and wherein the two coupling elements have interacting, selectively releasable locking elements, which lock the movable part to the fixed part in the holding position, • and the locking elements include a projection, referred to as a holder , on one coupling element and a hook on the other coupling element, wherein at least one of these two locking elements is movably mounted on the associated coupling element in such a manner that the two locking elements can be selectively moved between a locking position, in which the hook engages behind the holder , and a release position, in which the hook releases the holder , characterized in that the hook is configured as a horizontally oriented sheet-metal tab, and can be pivoted from above during use and moved between its locking position and its release position, wherein the handling connection is configured as an annular eyelet and is securely connected to the hook . • having a first coupling element referred to as a fixed part , which has a pipe connector , • and a second coupling element, which can be selectively connected to the fixed part and is referred to as a movable part , and which likewise has a pipe connector , which can be selectively connected to the fixed part and is referred to as a movable part , and which likewise has a pipe connector , • wherein the two coupling elements have interacting holding elements, such that the movable part is selectively held in a holding position on the fixed part and the two pipe connectors together form a pipeline portion, • and wherein the two coupling elements have interacting sealing surfaces , such that the movable part bears against the fixed part in a media-tight manner in the holding position, • and having a stop limiting the relative movement between the fixed part and movable part transversely to the central axis of the pipeline portion, • and wherein the movable part has a handling connection , which is intended to provide a selectively releasable connection to a handle that holds and guides the movable part , • and wherein the two coupling elements have interacting, selectively releasable locking elements, which lock the movable part to the fixed part in the holding position, • and the locking elements include a projection, referred to as a holder , on one coupling element and a hook on the other coupling element, wherein at least one of these two locking elements is movably mounted on the associated coupling element in such a manner that the two locking elements can be selectively moved between a locking position, in which the hook engages behind the holder , and a release position, in which the hook releases the holder , characterized in that the hook is configured as a horizontally oriented sheet-metal tab, and can be pivoted from above during use and moved between its locking position and its release position, wherein the handling connection is configured as an annular eyelet and is securely connected to the hook . <EOS>