located downstream of the equalizing chamber component 20 in the direction of pulp stock flow the turbulence component 14 typically comprising a plurality of mutually spaced lamellae extending parallel to the direction of flow the upper lip beam 13 of the headbox is located over the turbulence component 14 and a grating 16 is interposed between the equalizing chamber 21 and the turbulence component 14 referring to fig1 the equalizing chamber 21 is defined by lower and upper walls 26 27 respectively the upper wall 27 forming an aperture 30 through which the pulp stock rises to a level indicated by the dot dash line designated s the height of level s is defined by a weir wall 28 having an overflow channel at its upper region which communicates with the end of an overflow pipe 29 the air volume v is confined within a substantially cylindrical housing 22 having an outer reinforcing shell 23 the lower wall 26 of the equalizing chamber 21 comprises a part of a beam 26a having an enclosed box shaped cross section the system of distribution pipes 12 includes a planar coupling beam or flange 17 mounted at their downstream ends which extend in a direction transverse to the direction of pulp stock flow while the turbulence component 14 includes a planar coupling beam or flange 15 mounted at its upstream end according to the present invention the equalizing chamber component 20 is detachably affixed in its operative position between the planar beams 15 17 by quick connect apparatus as described below the respective planes defined by beams 15 17 intersect each other at an angle u03b1 which angle encompasses the direction designated f 1 in which the equalizing chamber component 20 is detached from the associated distribution header and turbulence component as mentioned.