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			 I am sure this is not the case BUT... are you sure that the back check valve is not installed up side down? 
		
	
		
		
		
		
			
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	Cheers ________________________ 210g Mixed Reef  | 
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			#2  
			
			
			
			
			
		 
		
		
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			 Quote: 
	
 Ive tested the pump to without any restrictions and it pumped fine submerged in a bucket of water outside.  |