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			 i just looked on the om website(as the last time i got a new mag drive they weren't making the om anymore) ,a new 4 way is $499 us.for a measly $140 more you could have the controllable flow.i use my om on top of my return pump which is not a closed loop system 
		
	
		
		
		
		
		
	
		
		
	
	
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