Full open Seat & wing guided Valve design features a large metal-to-metal bearing area for long life and the urethane bonded insert results in a perfectly round inset that prevents premature seal failures of the inserts. The insert is molded around the serrations, inserts failure due to tears from the serrations are eliminated. Most importantly the insert is not stretched over the valve during installation; there are no residual stresses from installation to shorten insert life.
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