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					Originally Posted by Doug Lowey
					
				 
				  How old is yours Deb. Perhaps the newer or older models are as Gazza describes.  Also you mention yours is a 3MD. Is that the same model as mine of the 3MDQX-SC, which is a higher flow, lower head model. It would have 1in. in and out. Mine is 3/4 in and 1/2 out. 
  
			
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 Yes, it is that exact model, however it is four years old so that could be it all right.