SRF Limited is the manufacturer of Hangar Covers or Gas Holders. The manufacturing unit of Viralimalai, SRF Limited is ISO 9001 certified. The Hangar Covers or bio gas holders are used for gas storage and feed to gas burners and lights, gas engines, boilers, heaters, etc. The gas holders or hangar covers find their usage in solid waste management, waste water treatment and household and municipal waste to energy projects. The gas holders range from 50 liter to 1000 liter capacity in pillow type and balloon type shapes.