Patent ID: 7765801

Claim:
An exhaust gas treatment device for internal combustion engines, comprising: an inlet end cap configured for communication with incoming exhaust gas; an outlet end cap configured for communication with exiting exhaust gas; first and second substrates adapted to treat exhaust gas flowing through said exhaust gas treatment device; a cylindrically-shaped first housing member having a hollow interior receiving and retaining therein said first substrate, a first end thereof operably connected with one of said inlet end cap and said outlet end cap to form an airtight seal therebetween, and an opposite second end thereof with a radially reduced section; and a cylindrically-shaped second housing member having an interior receiving and retaining therein said second substrate, a first end thereof operably connected with the other of said inlet end cap and said outlet end cap to form an airtight seal therebetween, and an opposite second end thereof with a radially enlarged section being sized to receive said second end of said first housing member therein to form an airtight seal therebetween, whereby said reduced section of said first housing member and said enlarged section of said second housing member are spaced radially apart a predetermined distance to define therebetween an annularly-shaped space which thermally insulates an associated portion of said exhaust gas treatment device.