The petcock or radiator draincock on your Impala, Biscayne, Bel Air or Caprice will get clogged with junk and debris from inside the radiator and the cooling system. Don't forget to buy a new petcock when you change out your radiator and keep that cooling system clean for as long as possible.
| Make | Model | Years |
| Chevrolet | Bel Air | 1958 - 1975 |
| Chevrolet | Biscayne | 1958 - 1972 |
| Chevrolet | Brookwood | 1958 - 1960 |
| Chevrolet | Caprice | 1966 - 1984 |
| Chevrolet | Del Ray | 1958 |
| Chevrolet | Estate | 1969 - 1970 |
| Chevrolet | Impala | 1958 - 1972 |
| Chevrolet | Nomad | 1958 - 1960 |
| Chevrolet | Parkwood | 1959 - 1960 |
| Chevrolet | Townsman | 1969 - 1972 |
| Chevrolet | Yeoman | 1958 |
