A fluid conduit assembly (20, 220) comprising: first and second fluid conduits (22, 24); a coupling including first and second coupling sections (26, 28), each coupling section defining a respective hollow bore along which flowable material may flow, the first coupling section in fluid connection with the first fluid conduit, the second coupling section in fluid connection with the second fluid conduit, the coupling sections (26, 28) configured to be releasably coupled to each other; and at least one shut-off valve located within the hollow bore of at least one of the coupling sections (26, 28), the or each shut-off valve including a valve member (32, 232) movable between a valve open position and a valve closed position in which the valve member (32, 232) shuts off the flow of a flowable material through the hollow bore, the or each valve member (32, 232) configured to move to its valve closed position on separation of the coupling sections (26, 28), wherein the first coupling section is connected to the first fluid conduit so that a first end of the first coupling section extends inside a hollow bore of the first fluid conduit and a second end of the first coupling section is located outside the hollow bore of the first fluid conduit, and/or wherein the second coupling section is connected to the second fluid conduit so that a first end of the second coupling section extends inside a hollow bore of the second fluid conduit and a second end of the second coupling section is located outside the hollow bore of the second fluid conduit, characterised in that the or each first end (36, 40), extending inside the hollow bore of the respective fluid conduit (22, 24), has a tapered bore profile that tapers in a direction towards the corresponding second end (38, 42). first and second fluid conduits (22, 24); a coupling including first and second coupling sections (26, 28), each coupling section defining a respective hollow bore along which flowable material may flow, the first coupling section in fluid connection with the first fluid conduit, the second coupling section in fluid connection with the second fluid conduit, the coupling sections (26, 28) configured to be releasably coupled to each other; and at least one shut-off valve located within the hollow bore of at least one of the coupling sections (26, 28), the or each shut-off valve including a valve member (32, 232) movable between a valve open position and a valve closed position in which the valve member (32, 232) shuts off the flow of a flowable material through the hollow bore, the or each valve member (32, 232) configured to move to its valve closed position on separation of the coupling sections (26, 28), wherein the first coupling section is connected to the first fluid conduit so that a first end of the first coupling section extends inside a hollow bore of the first fluid conduit and a second end of the first coupling section is located outside the hollow bore of the first fluid conduit, and/or wherein the second coupling section is connected to the second fluid conduit so that a first end of the second coupling section extends inside a hollow bore of the second fluid conduit and a second end of the second coupling section is located outside the hollow bore of the second fluid conduit, characterised in that the or each first end (36, 40), extending inside the hollow bore of the respective fluid conduit (22, 24), has a tapered bore profile that tapers in a direction towards the corresponding second end (38, 42).