A fastener-driving tool comprising a trigger-actuated control valve assembly disposed within a fastener-driving tool housing of said fastener-driving tool and comprising: a trigger-actuated control valve housing; a trigger-actuated control valve member disposed within said trigger-actuated control valve housing; window means (156, 158), defined within said trigger-actuated control valve housing, in fluidic communication with a substantially horizontally oriented port defined within a first lower end portion of a substantially vertically oriented air passageway which is defined within the fastener-driving tool housing and which is fluidically connected at a second upper end portion thereof with a control air chamber of the fastener-driving tool; a lower section of said trigger-actuated control valve housing having a diametrical extent which is greater than the diametrical extent of an upper section of said trigger-actuated control valve housing so that an outer peripheral portion of said lower section of said trigger-actuated control valve housing extends radially beyond an outer peripheral portion of said upper section of said trigger-actuated control valve housing in order to define a space within which the first lower end portion of the substantially vertically oriented air passageway, and the substantially horizontally oriented port defined within the first lower end portion of the substantially vertically oriented air passageway, can be accommodated said lower and upper sections of said trigger-actuated control valve housing being adapted to be fixedly mated together by means of a bayonet-type connection, characterized in that said lower section of said trigger-actuated control valve housing is disposed in an eccentric manner with respect to said upper section of said trigger-actuated control valve housing. a trigger-actuated control valve housing; a trigger-actuated control valve member disposed within said trigger-actuated control valve housing; window means (156, 158), defined within said trigger-actuated control valve housing, in fluidic communication with a substantially horizontally oriented port defined within a first lower end portion of a substantially vertically oriented air passageway which is defined within the fastener-driving tool housing and which is fluidically connected at a second upper end portion thereof with a control air chamber of the fastener-driving tool; a lower section of said trigger-actuated control valve housing having a diametrical extent which is greater than the diametrical extent of an upper section of said trigger-actuated control valve housing so that an outer peripheral portion of said lower section of said trigger-actuated control valve housing extends radially beyond an outer peripheral portion of said upper section of said trigger-actuated control valve housing in order to define a space within which the first lower end portion of the substantially vertically oriented air passageway, and the substantially horizontally oriented port defined within the first lower end portion of the substantially vertically oriented air passageway, can be accommodated said lower and upper sections of said trigger-actuated control valve housing being adapted to be fixedly mated together by means of a bayonet-type connection, characterized in that said lower section of said trigger-actuated control valve housing is disposed in an eccentric manner with respect to said upper section of said trigger-actuated control valve housing.