Exhibit 23.3

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the use in this Amendment No. 5 to Registration Statement No. 333-127578 of our report dated August 15, 2005, relating to the statement of financial position of Boardwalk GP, LP, appearing in the Prospectus, which is a part of such Registration Statement, and to the reference to us under the heading “Experts” in such Prospectus.

/s/ Deloitte & Touche LLP

Chicago, Illinois

November 3, 2005