A fire extinguisher comprising: a cylinder for storing a fire extinguishing agent, the cylinder comprising a neck portion; a siphon tube extending downwardly into the cylinder from the neck portion, the siphon tube configured to deliver the fire extinguishing agent from within the cylinder, characterized in that: the siphon tube comprises a circumferential groove; and in that the fire extinguisher further comprises a coupler for connecting to the siphon tube, the coupler comprising: a body comprising a radially outward facing surface, a radially inward facing surface, a proximal end, and a distal end; and a foldable section disposed at the proximal end, the foldable section comprising an unfolded position defining an unfolded internal diameter (D UF) and a folded position defining a folded internal diameter (D F), the foldable section configured to receive a proximal end of the siphon tube in the unfolded position and to secure to the circumferential groove in the folded position. a cylinder for storing a fire extinguishing agent, the cylinder comprising a neck portion; a siphon tube extending downwardly into the cylinder from the neck portion, the siphon tube configured to deliver the fire extinguishing agent from within the cylinder, characterized in that: the siphon tube comprises a circumferential groove; and in that the fire extinguisher further comprises a coupler for connecting to the siphon tube, the coupler comprising: a body comprising a radially outward facing surface, a radially inward facing surface, a proximal end, and a distal end; and a foldable section disposed at the proximal end, the foldable section comprising an unfolded position defining an unfolded internal diameter (D UF) and a folded position defining a folded internal diameter (D F), the foldable section configured to receive a proximal end of the siphon tube in the unfolded position and to secure to the circumferential groove in the folded position. a siphon tube extending downwardly into the cylinder from the neck portion, the siphon tube configured to deliver the fire extinguishing agent from within the cylinder, characterized in that: the siphon tube comprises a circumferential groove; and in that the fire extinguisher further comprises a coupler for connecting to the siphon tube, the coupler comprising: a body comprising a radially outward facing surface, a radially inward facing surface, a proximal end, and a distal end; and a foldable section disposed at the proximal end, the foldable section comprising an unfolded position defining an unfolded internal diameter (D UF) and a folded position defining a folded internal diameter (D F), the foldable section configured to receive a proximal end of the siphon tube in the unfolded position and to secure to the circumferential groove in the folded position. the siphon tube comprises a circumferential groove; and in that the fire extinguisher further comprises a coupler for connecting to the siphon tube, the coupler comprising: a body comprising a radially outward facing surface, a radially inward facing surface, a proximal end, and a distal end; and a foldable section disposed at the proximal end, the foldable section comprising an unfolded position defining an unfolded internal diameter (D UF) and a folded position defining a folded internal diameter (D F), the foldable section configured to receive a proximal end of the siphon tube in the unfolded position and to secure to the circumferential groove in the folded position. a body comprising a radially outward facing surface, a radially inward facing surface, a proximal end, and a distal end; and a foldable section disposed at the proximal end, the foldable section comprising an unfolded position defining an unfolded internal diameter (D UF) and a folded position defining a folded internal diameter (D F), the foldable section configured to receive a proximal end of the siphon tube in the unfolded position and to secure to the circumferential groove in the folded position.