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By certification 
Octagonal Type cross section RTJ ring joint gaskets are designed for flanges with standard grooves,interchangeable with oval ring joint gaskets on modern octagonal grooved flanges,but has a higher sealing coefficient than the oval ones, RING NO for pipe sizes, it is the same as oval series,please reference the form .
TECHO is one of the leading manufacturers and suppliers of various sealing products in China. We have skillful and experienced workers in our factory. Now take action to wholesale quality soft iron ring joint gasket made in China with us.
