Response to I have an old stainless steel de filter. I believe it is a Pentair. There are 8 full size grids that "plug in" the bottom of the filter. No partial grid. I think I've ordered 1224 in the past. The end that plugs in has 1 notch on the outside. Can you confirm from my pictures? Time to order an o-ring too. I've had a couple that the plug in end had 2 notches, but were too narrow to seat correctly.

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