O-rings and guide rings are both used on hydraulic cylinders, but they handle different tasks. O-rings are often the first choice for engineers because of their flexibility and performance in static ...

The trapezoidal shape is said to eliminate the possibility of the O-ring popping out, unlike standard round-shape O-rings that rely on being pinched by the groove retaining ring for seal retention.

That box of assorted rubber O-rings under the workbench in your shop might supply the cure to leaky hydraulic connections, or it might just interrupt the leak for a day or two. Flat-face hydraulic ...