A 16mmx1.5 tapered pipe plug, useful for plugging the vacuum temp sensor and EGR port(s) on DOHC and SOHC engines. Don't use use a hacksawed bolt or incorrect plug.
Fiat X19 / 128 1300cc (76-77) - 1 required for head (emissions thermoswitch)
Fiat X19 / 128/ Strada (78-80) - 1 required for head (EGR port).
Fiat 124 Spider 2.0L (79) - 2 required for head (EGR port).