By the way, in regards to replacement parts, I believe I've read about one or two of the US Ebay sellers being good about sending out replacements. And as far as the Marineland C-series goes, I can't speak for all of them, but I know I've seen C-series pics that are almost identical to SunSun 302 pics, except for color. I would bet that you can match up models by claimed gph ratings and get replacements that way.
They really are very different if you look at them, the sun sun is more akin to the JBJ can.
A lot of people speculate but I have yet to see any reports from finding parts on similar canisters.
I would like to know for sure so I could pass along the info...