Edelbrock heat exchanger part # 15405 is a single pass/single row design and delivers 31,000 btu/hr. Includes a 3/4" barbed inlet and outlet for plumbing, along with M6x1.0 threaded bungs for mounting. Heat Exchanger part # 15405 is a Single Pass/Single Row Universal Heat Exchanger with the following dimensions (22"W x 16.5"H x 1.5"D) and has 8 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.