Powerheads on the overflow box. Questions...

[epleeds]

I want to mount some smaller powerheads on my overflow box. Aside from the tunze pumps, does anyone know what other pumps have the “outside” magnet that’s fully sealed and can also be submerged in saltwater. The reason I ask is 99.9% of the time the “outside” magnet is on the outside of the tank 

[WheresTheReef]

Not sure, but have you considered using some kind of epoxy or plastic coating to seal it? If you search around it's likely someone has done this before.

[JJKK]

The Jebao PP8 interior magnet look exactly the same as the one designated for the outside.  You can also vacuum seal if you have a foodsaver,

[flooddc]

I not sure of other brands but jebao's powerhead magnets are the same for the internal and external. Also, sure grip magnet (comparable for tunze powerhead) are also can me mounted inside.