The Planted Tank Forum - View Single Post - My Review: SunSun "Outside Filter" HW-302
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post #607 of (permalink) Old 04-28-2012, 04:19 PM
In.a.Box
Wannabe Guru
 
Join Date: Dec 2011
Location: New England
Posts: 1,116
Quote:
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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