Spectra Premium Heaters are original equipment quality at a very competitive price with 100 per cent quality assurance. Only the highest grades of materials are used in production to ensure product longevity. The fully brazed aluminum design is available for more than 95 per cent of aftermarket demand. All heater cores are 100 per cent leak d and drop in fit for easy installation. Spectra Premium Heaters are designed for exact fit in the vehicle's original equipment heater casing.Heater Core Inlet Size:0.75 inch