A well containment assembly, comprising: a first pressure-containing device; and a diverter spool, the diverter spool comprising: a body having a longitudinal central axis and at least partially defining a primary flowbore; an upper connection assembly coupled to the body; a lower connection assembly coupled to the body; and a plurality of side outlets, each of the plurality of side outlets having a longitudinal central axis and at least partially defining a secondary flowbore; wherein each of the plurality secondary flowbores are in communication with the primary flowbore, and wherein the angle (α) between the longitudinal central axis of the body and the longitudinal central axis of the plurality of side outlets is less than 90° with respect to the primary flowbore, wherein the first pressure-containing device is coupled to the diverter spool via the upper connection assembly, characterised in that the body and side outlets are configured such that at least about 75% of the volume of fluid entering the diverter spool is expelled therefrom via the side outlets and the total flow area of the secondary flowbore is at least 75% of the flow area of the primary flowbore. a first pressure-containing device; and a diverter spool, the diverter spool comprising: a body having a longitudinal central axis and at least partially defining a primary flowbore; an upper connection assembly coupled to the body; a lower connection assembly coupled to the body; and a plurality of side outlets, each of the plurality of side outlets having a longitudinal central axis and at least partially defining a secondary flowbore; wherein each of the plurality secondary flowbores are in communication with the primary flowbore, and wherein the angle (α) between the longitudinal central axis of the body and the longitudinal central axis of the plurality of side outlets is less than 90° with respect to the primary flowbore, wherein the first pressure-containing device is coupled to the diverter spool via the upper connection assembly, characterised in that the body and side outlets are configured such that at least about 75% of the volume of fluid entering the diverter spool is expelled therefrom via the side outlets and the total flow area of the secondary flowbore is at least 75% of the flow area of the primary flowbore. a body having a longitudinal central axis and at least partially defining a primary flowbore; an upper connection assembly coupled to the body; a lower connection assembly coupled to the body; and a plurality of side outlets, each of the plurality of side outlets having a longitudinal central axis and at least partially defining a secondary flowbore; wherein each of the plurality secondary flowbores are in communication with the primary flowbore, and wherein the angle (α) between the longitudinal central axis of the body and the longitudinal central axis of the plurality of side outlets is less than 90° with respect to the primary flowbore, wherein the first pressure-containing device is coupled to the diverter spool via the upper connection assembly, characterised in that the body and side outlets are configured such that at least about 75% of the volume of fluid entering the diverter spool is expelled therefrom via the side outlets and the total flow area of the secondary flowbore is at least 75% of the flow area of the primary flowbore.