Edelbrock heat exchanger part # 15569 is a dual pass/single row design and delivers 44,600 btu/hr. Includes a 3/4" barbed inlet and outlet for plumbing, along with M6x1.0 threaded bungs for mounting. Heat exchanger part # is a Dual Pass/Single Row Universal Heat Exchanger with the following dimensions (24"W x 16.5"H x 2.12"D) with 4 threaded bungs. Edelbrock offers a wide selection of Universal Heat Exchangers to work with the E-Force Universal or Enforcer Supercharger systems. Edelbrock heat exchangers offer reliability and durable construction for high performance street applications.