KUALA LUMPUR: Petronas Dagangan Bhd (PetDag) said it plans to sell its liquefied petroleum gas (LPG) business to PetrosNiaga Sdn Bhd (PNiaga) and subscribe to a 49 per cent stake in PNiaga as part of a business transfer and share subscription agreement (BTSSA) with PNiaga and Petroleum Sarawak Bhd (PETROS).