Edelbrock heat exchanger part #15569 is a dual pass/single row design and delivers 44,600 btu/hr Includes a 3/4in. 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 (24in. W x 16.5in. H x 2.12in. D) with 4 threaded bungs. Edelbrock offers a wide selection of Universal Heat Exchangers to work with the Edelbrock Universal or Enforcer Supercharger systems. Edelbrock heat exchangers offer reliability and durable construction for high performance street applications.