Threaded Joint Right Mouth 290mm Main Heat Exchanger For Viessmann Gas Boilers ReplacementPackage Include :one 290mm Heat exchangerPlease note that the thread of this warmth exchanger is at the right side, please investigate the outlet path closely earlier than putting the order, don't buy unsuitable listen in on the process the mouth ,there are 2 forms , please verify carefully shop also sells assorted types of warm temperature exchangers, if you'd like it, you could seek the advice of customer service, or look for it within the store.