Southern Cogen Systems Pvt. Ltd. Manufactures Snap Cap Type Coarse Bubble. Southern Cogen Systems Pvt. Ltd. Is the supplier of Gas burners, duo block gas burners and oil gas burners used in industrial furnaces and boilers. Snap Cap Type Coarse Bubble represents a substantial advancement in the art of diffuser design. Snap Cap Type Coarse Bubble consists of two simple parts, the support base and a flexible snap-on check diaphragm. The novel edge designs of the diffuser lock on the removal diaphragm to avoid blow off unusual pressure surges. Snap-Cap diffusers will handle air flows from 5 m3/hr to17 m3/hr.