Fiat Spiders made from 1974 to 1978 with the 1800 engine came with air injection as a form of emissions control. This system injected fresh air into the exhaust ports to allow for fuller combustion of exhaust gases.
Over the years, many of these cars have had their air injection systems removed. These plugs block off the four injection ports on your cylinder head.
Installation requires a 6mm hex key.
Fitment:
1974-1978 Fiat 124 Spider 1800