fiddlersport Posted December 8, 2014 Share Posted December 8, 2014 Hi will be replacing most of the engine vac pipes since a few of them look old and worn and wanted to know if there is any special size required ? inside id and outer id ? Quote Link to post Share on other sites
FMuscle Posted December 8, 2014 Share Posted December 8, 2014 I'd go with 7 or 8mm ID. Going silicone I'd go more on 7, the silicone easily stretches over the fittings anyways. Quote Link to post Share on other sites
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