I thought it was for the new Magniflow 360. Actually it's for the C-360 Series C. The newer Magniflow has orange hose clamp handles on the valve block assembly and has a #ML90772 gasket kit. As far as I know, it can currently only be ordered directly from Marineland. Ordering direct from Marineland, I just paid $13.10 for a gasket kit and $13.88 for "shipping and handling". Choose wise. I decided to keep this gasket kit to myself. I have been keeping aquariums of various sizes for about 30 years. One of the many things I've found is that you never know what might happen next in the world of filters. Maybe I'll take a used C-360 that needs seals.
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