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<x-charset Windows-1252>There's a picture from the Parts book of that manifold on the URL below. It's just a tube that warms the intake mixture. There is also a warm air intake pipe (visible lower on the page) which goes to the air cleaner. Later ones (certainly the twin carb versions) were thermostatically controlled. The pre-heater improves warm up times which helps reduce engine wear. www.hallvw.clara.co.uk/type3/T3pbo/T3pb1-56.htm Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org </x-charset>