Heat Exchanger Water to Air Intercooler and Water Pump Heat Exchanger: Overall size:31.5x9.5x2.75(end-tank) inch Heat Exchanger: Inlet and outlet sizes:3/4 (0.75) inch Liquid Water to Air Intercooler: Overall Size:18"x13"x4.5" Liquid Water to Air Intercooler: Core:4.5" Water Pump: 12VDC3/4" Water inlet outlet