Gas burners acc. to Bunsen and DIN basic version with air control, Natural gasLaboratory Bunsen burner, acc. to DIN, for natural gas, basic version with air control Acc. to DIN. Suitable for propane gas or natural gas. Connection for hose with inside 9. 5 mm. Made of die cast zinc. Note: DIN burners cannot be turned off completely in acc. with standard 30665. Therefore, a small flame continues to burn even when the gas tap or needle valve is closed. For safety reasons, the user is forced to shut off the gas supply for the