MARKWEST ENERGY PARTNERS, L.P. 1,148,000 Common Units Representing Limited Partner Interests UNDERWRITING AGREEMENTMarkwest Energy Partners L P • December 31st, 2003 • Crude petroleum & natural gas • Kansas
The undersigned, MarkWest Energy Partners, L.P., a Delaware limited partnership (the "Partnership"), MarkWest Energy Operating Company, L.L.C., a Delaware limited liability company (the "Operating Company"), MarkWest Energy GP, L.L.C., a Delaware limited liability company (the "General Partner"), and the selling unitholders listed on Schedule II hereto (the "Selling Unitholders"), hereby address you as the "Underwriters" and hereby confirm their agreement with the several Underwriters named below. The Partnership, the Operating Company and the General Partner are collectively referred to herein as the "MarkWest Parties."
