I have a Jandy PMPH1.5. Last year I had air bubbles in the return. I order a new seal which turned out to be the wrong part. I have located the correct part but it included a seal(square-ish gasket) and an o-ring. The squarish gasket seems to have a channel on one side and a "half" on ring on the other. The Jandy parts diagram does not show where the o-ring goes. Does the lid seal and o-ring go together or does the o-ring go on the sight window between it and the lock ring? If there was on o-ring before, it disappeared....