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Eberspacher heater combustion air inlet intake silencer muffler Genuine Eberspacher accessory upgrade Guaranteed to make your Eberspacher heater considerably quieter Technical support, Eberspacher exhaust silencers and other additional products available from Butler Technik Dimensions Overall length - 565mm Internal diameter - 25mm Silencer section length - 400mm Silencer section outside diameter - 50mm Suitable for many Eberspacher heaters including Eberspacher Airtronic D2 Eberspacher Airtronic S2 D2L Eberspacher Airtronic D4 Eberspacher Airtronic D4 (S) Plus Eberspacher Airtronic M2 B4L Eberspacher Airtronic M2 D4L