Patent ID: 8225826

Claim:
A fluid transfer device for transferring fluid from a first fluid container to a second fluid container, said fluid transfer device comprising a longitudinal axis and a first connection part comprising a connector that connects to said first fluid container, wherein said fluid transfer device further comprises a second connection part rotatably mounted to said first connection part by a mounting element, wherein said second connection part comprises a threaded coupling element that connects to said second fluid container, wherein said fluid transfer device is further arranged with at least one protrusion, wherein said at least one protrusion substantially prevents said first connection part from turning in a predetermined direction with respect to said second connection part thereby enabling assembly with said first fluid container, while still allowing said first connection part to turn in a direction opposite of said predetermined direction thereby preventing disassembly with said first fluid container, wherein said first connection part is provided with a flexible barrier member for providing a leakage seal.