For use when fitting a diesel heater on a VW Transporter T6 & T6.1, or VW Crafter 2017 onwards. On the T6 & T6.1 and new shape Crafter VW very kindly installed a pickup tube for an axillary heater. The pickup tube is capped off normally, but by cutting the cap off you can clip this adaptor onto the tube without having to drill or even remove the fuel sender.
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