Abstract: A pump is shown with a sealing means for providing static seals along liners slidably receiving the pistons of the pump. The sealing means includes a metal cylindrical ring having a generally wedge-shaped outer edge. In the wedge-shaped outer edge is bonded a resilient sealing material, which sealing material extends outwardly from the metal ring at a small angle. The resilient sealing material also extends beyond one end of the metal ring with an undercut on the innermost edge of the resilient material. After assembly, the metal ring provides a stiff assembly necessary for intermittent operation of the pump in climates having large temperature variations. The resilient sealing material provides sealing along two adjacent surfaces of the liners. Other seals along the liner may be replaced to include combinations of metal for stiffness and resilient material for sealing.