Recent content by PaulMc

That's a Lucas-Rists E Series splashproof 5-way connector. They're getting pretty hard to find these days - but, this place still sell them - https://www.3waycomponents.co.uk/product/lucas-rists-5-way-e-series-circular-sealed-connector-kit-51156192-51156193/

That's the diagnostic connector for the EGR unit. Frobisher is correct, it's the same 3-way connector as used for D1, RRC, Def.V8 O2 sensors.