This pump?

[LukeOscar]

Is this pump safe to use as an external return pump for a sump?

I got one free in a trade.

https://www.equipment2u.com/shop/Simer_Pump_Mini_Vac_Pump/41355



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[dscort]

looks very similar to my transfer pump. not really efficient and probably pretty loud. i dont think they are set up for continuous use.

 

[Gill Blue]

http://www.simerpumps.com/resources/images/755408.pdf