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KRHD Grooved Couplings(Hoop): Off-type expansion joints is a reliable product for easy installation of connecting pipes. At low pressure,seal well rely on the elastic deformation of sealing-washers.when increasing in pressure, seal itself by mediums in action on the sealing-washers .Because Expansion and Contraction can cause the displacement and flexural, so it must reserve some space in the inner to make reparation of pipe.
