Abstract: A method of molding an elastomeric resilient ring member having a generally +-shape comprising the steps of providing a mold having a pair of mold halves, each having an exposed annular mold cavity therein, the surface defining each of the cavities comprising first and second inwardly directed lobes extending at a 90.degree. angle to each other from the inner corners of the cavity, at 45.degree. angles to the plane of the cavity; and using such a mold for molding, in a conventional manner, a resilient ring member.

Abstract: A rod gland assembly comprising a rod gland core made from a rigid material and adapted to be positioned in a cylinder, between the cylinder bore and a piston rod, and a multiple function seal/wiper/piston cushion element molded from a flexible material on the rod gland core, the multiple function element including a rod seal, a bore seal, a piston cushion, and a wiper/scraper.

Abstract: An elastomeric resilient ring spring for use in an annular elastomeric boot generally of a U-cup configuration having an exposed annular groove which is generally x-shaped, the ring spring being generally +-shaped including four lobes, first and second opposed lobes extending parallel to the plane of the ring spring and third and fourth opposed lobes extending perpendicular to the plane of the ring spring. The dimensions of the ring spring are approximately the same as those of the groove whereby rotation of the ring spring about its ring axis through an angle of 45.degree. permits mating of the ring spring into the groove in the boot. Such a ring spring may be molded in a conventional mold in a far simpler manner than conventional x-shaped ring springs.

Abstract: A piston comprising a core molded from a rigid thermoplastic material and a seal element molded on the core from a flexible thermoplastic material to form a unitary assembly.