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> Any idea why the water cooled cars got them? > Maybe their position - in the front area where all the spray flies around? The upright engine in my '74 camper also has one. I wonder if it reduces the risk of a spark igniting any fuel vapours; it does fit quite tightly. Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org