a coupling joint for releasably coupling two telescoping tubular members in sealing relationship to one another , one of the tubular members being continuously urged inwardly relative to the other tubular member whereby a seal between said members may be maintained at all times . the coupling joint , which may be utilized in a valve or the like with the valve body representing one of the tubular members and a bushing representing the other of the tubular members inserted into the open end of the valve body , includes the use of a resilient ring such as an o - ring for retaining the two tubular members together , the ring being positioned in opposed grooves in the telescoped portion of the tubular members . one of the grooves on one of the tubular members is a retaining ring groove for retaining the resilient ring during assembly of the two tubular members , and the other of the grooves on the other of the tubular members is a groove having a camming surface thereon so oriented that when the grooves are opposed to one another with the resilient ring therebetween , the compressive forces in the resilient ring seeking to expand the same exert resultant forces on the tubular members to cause said tubular members to be urged toward one another .