All models and brands of Valve fittings for use with liquefied petroleum gas cylinders of more than 5 litre water capacity Part 2 Valve fittings for newly manufactured LPG cylinders are classified under IS 8737 and are required to get ISI Certification before its launch or import into the Indian market. ISI Certification will be provided to the product manufacturers (whether Indian or non-Indian) only and not provided to trader, dealer or distributor of the product.