Concessional customs duty on liquified propane and butane introduced, amending tariff notification and effective immediately. The notification amends Notification No. 50/2017-Customs by inserting a new tariff table entry for specified tariff headings covering liquified propane and liquified butane and prescribing a concessional basic customs duty for those imports. The amendment is issued under section 25 of the Customs Act, 1962 and section 3(12) of the Customs Tariff Act, 1975 as necessary in the public interest and is effective immediately.