Eximious Ventures Pvt. Ltd. Manufactures Double Core Cooling Water Circuit. Eximious Ventures Pvt. Ltd. Is an ISO 9001:2008 and ISO 14001:2004 certified company. Double Core Cooling Water Circuit is a valve packing made of 100% pure PTFE. Double Core Cooling Water Circuit is provided with core which squeezes in all directions to fill all voids and crevice. It can resist all fluids except free fluorine and molten alkali metals. It has unlimited shelf life. The model name of this circuit is Macstar 2800.