Bosch Hob Installation Instructions Manual page 18

Parts for gas
conversion
18
See below for pictures of the parts required.
The correct nozzle diameter is indicated in the
"Technical data - Gas" table.
Always use a new seal.
The gas connecting pieces may vary according to
type of gas and country requirements.
Burner nozzle
Seal
Connecting piece for natural gas ISO 7 1
Connecting piece for natural gas (NG: G20)
Connecting thread