I bought this nipple hoping it would fit an older existing nipple. The original fitting has a flat/socket on the male side, O-rings (two of them in the old fitting) on the male side. This fitting is opposite. The sealing ring is mounted on the inside, the flat mating surface is on the connector side. The three stars are not for this installation issue, but because the o-ring has deformed roughness with marks that look like a mold bar has been sheared off. A file is required to remove any remaining burrs. This "fixing" is not necessary for a new assembly. By the way, there is ONE O-ring in this context, not two. I didn't see the double ring connection before I took my lines apart. IF you're hoping to get your two ring connection together and don't have room to replace it entirely, THIS part may NOT be for you.
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