Abstract: A sealing ring for sealing between opposed surfaces of a bore and a rod extending axially in the bore has a recess, preferably in the form of a narrow axially-opening annular slot, behind one or mote sealing lips thereof. The dimensions of the recess are selected so that its opposed radial faces are squeezed together in the installed condition of the seal, giving a positive radial squeeze of seal material behind the sealing lips. The positive squeeze enables a stronger sealing force to be achieved, while the presence of the recess reduces overall radial compression force and hence avoids excessive friction.