A breakaway assembly for use in a medical tubing system, the breakaway assembly comprising: a first breakaway subassembly comprising: a first sheath channel disposed within the first breakaway subassembly; a first fluid passageway disposed within the first breakaway subassembly and connected to the first sheath channel via a first pore; and a first bellows sheath positioned within the first sheath channel, the first bellow sheath configured to selectively interrupt the flow of fluid into the first sheath channel when the first bellows sheath is in a first position and configured to permit the flow of fluid into the first pore when the first bellows sheath is in a second position; and a second breakaway subassembly comprising: a second sheath channel disposed within the second breakaway subassembly; a second fluid passageway disposed within the second breakaway subassembly and connected to the second sheath channel via a second pore; and a second bellows sheath positioned within the second sheath channel, the second bellow sheath configured to selectively interrupt the flow of fluid into the second pore when the second bellows sheath is in a first position and configured to permit the flow of fluid into the second pore when in the second bellows sheath is in a second position; and wherein the engagement of the first breakaway subassembly with the second breakaway subassembly causes the first bellow sheath to move from its first position to its second position while causing the second bellow sheath to move from its first position to its second position. a first breakaway subassembly comprising: a first sheath channel disposed within the first breakaway subassembly; a first fluid passageway disposed within the first breakaway subassembly and connected to the first sheath channel via a first pore; and a first bellows sheath a first sheath channel disposed within the first breakaway subassembly; a first fluid passageway disposed within the first breakaway subassembly and connected to the first sheath channel via a first pore; and a first bellows sheath positioned within the first sheath channel, the first bellow sheath configured to selectively interrupt the flow of fluid into the first sheath channel when the first bellows sheath is in a first position and configured to permit the flow of fluid into the first pore when the first bellows sheath is in a second position; and a second breakaway subassembly comprising: a second sheath channel disposed within the second breakaway subassembly; a second fluid passageway disposed within the second breakaway subassembly and connected to the second sheath channel via a second pore; and a second bellows sheath positioned within the second sheath channel, the second bellow sheath configured to selectively interrupt the flow of fluid into the second pore when the second bellows sheath is in a first position and configured to permit the flow of fluid into the second pore when in the second bellows sheath is in a second position; and wherein the engagement of the first breakaway subassembly with the second breakaway subassembly causes the first bellow sheath to move from its first position to its second position while causing the second bellow sheath to move from its first position to its second position. a second sheath channel disposed within the second breakaway subassembly; a second fluid passageway disposed within the second breakaway subassembly and connected to the second sheath channel via a second pore; and a second bellows sheath positioned within the second sheath channel, the second bellow sheath configured to selectively interrupt the flow of fluid into the second pore when the second bellows sheath is in a first position and configured to permit the flow of fluid into the second pore when in the second bellows sheath is in a second position; and wherein the engagement of the first breakaway subassembly with the second breakaway subassembly causes the first bellow sheath to move from its first position to its second position while causing the second bellow sheath to move from its first position to its second position.