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			#12  
			
			
			
			
			
		 
		
		
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			 You only need as many valves in the BA as you do in the Herbie. I am also a huge fan of the Herbie, but generally employ them on tanks that have the corner overflow pre-built only. Redundancy is an immensely important and often overlooked paradigm in this hobby. 
		
	
		
		
		
		
		
	
		
		
	
	
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