Nature2 Fusion leak?

It is solid plastic. Looks like there may be moisture on the outlet side...ensure both of the input and output rings are tight.

It is also possible that the o-ring on the drain plug (bottom of the photo in your pic). You can try the plug and lubricate the o-ring with a silicone LUBRICANT like magic lube II (NOT SEALANT). Do not use a teflon/ptfe based lubricant. If that does not work, replace the o-ring. They go bad and many of us replace all o-rings on an annual basis to avoid issues...cheap insurance for the pool season.

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