The Planted Tank Forum - View Single Post - My Review: SunSun "Outside Filter" HW-302
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Old 04-28-2012, 04:19 PM   #607
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Originally Posted by Duane View Post
There is a clear round piece in the return side with a flapper on it. Does it need to stay in or be taken out?
It stay in.
That piece is there to block backflow.
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