Rubber cylinders  are mainly used in the test of conduits in high buildings ,construction  checking and maintenance of coal gas ,natural gas and air  raid shelter conduits .Being made of natural rubber ,it is characterized in high resilience , high-strength ,good blocking effect  and recyclability .For high-pressure pipelines , we insert three elastic strings in the airbags to attain better and safer blocking effect, With our products , projects would be labor-saving ,economical ,energy-saving and environmental protection .We exported our inflatable pipeline stoppers to Japan in 2009.