Best sealant between concrete pond and plastic Savio skimmer?

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I have a concrete pond with a Savio skimmer set into it.

What is the best sealant/caulk between the concrete pond and the skimmer? Fish safe and able to handle being under water.

I know it is hard to seal between 2 different materials, but it is what it is.

It is only the top few inches just below the water level. I have let the pond drain to the point it leaks and it has been days so I have given it some time to dry. Luckily the water level is above the skimmer intake so the pond is fine, just lower than it usually is.

The pond is almost 2 years old.

Thank you for your comments and experience.
 

JRS

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I'd use a polyurethane based sealant. Have used the black roof flashing variety to edge a submerged liner patch.
 

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