The specification discloses a number of pipe coupling devices for sealingly connecting the adjacent ends of two coaxially disposed pipe sections. All of the devices utilize a common principle for effecting compression of a gasket ring seal, namely the transfer of the turns of a spiral or helical band of relatively thin gauge metal from one side to the other of a cylindrical or disc-like radial wall in a housing, through a slotted opening in the housing wall or between two successive roller bearings carried on the housing, by relative rotation of the housing and the spiral or helical band coaxially with respect to the pipes to be joined. All embodiments have a pair of ring seals, one for each pipe section, the ring seals being integrally joined or separate. In certain embodiments, the ring seals are simultaneously or separately compressed by rotation of the housing with respect to the spiral or helical band. In other embodiments the helical band is bonded at opposite ends to a circular sleeve coaxial to the pipe and intervening between the pipe and the housing. In these embodiments, compression of the gasket ring seals may be effected by rotation of the circular sleeves relative to the housing or vice versa.