| 1. Gas treatment apparatus for treating the exhaust gas stream, the apparatus comprising a plurality of compartments within
which one or more treatments are to be performed upon a gas flowing through said compartments, the gas treatment apparatus
including a removable endcap, at least one central compartment including a treatment element therein secured against axial
movement at each end of said treatment element, said central compartment being substantially surrounded by an annular compartment
in a substantially concentric arrangement, characterised in that the end cap is secured to the apparatus by a circumferential
clamp and the treatment element is secured at least at one end by removable axial retaining apparatus comprising a secured
member secured against axial movement, the treatment element being removable from within the central compartment by axial
movement of said treatment element after removal of the removable end cap and axial retaining apparatus, wherein the secured
member is secured in place by engagement of at least one projection from said secured member with a slot in the wall of the
compartment, wherein the secured member is a split ring having a radially inwardly directed portion and in which the removable
retaining apparatus further includes an expandable annular member for location between the treatment element and the secured
member, the expanding annular member including a radially outwardly narrowing peripheral portion.
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