So that's what a poppit valve does,  mine to  the temp hoes way up at slow speed  I have to get going to bring gone temp down   Thermostats are changed  every year  impeller is not to old    Poppit valve, I did change  it about ten years ago    Hmm   I think I'm due
		 
		
		
		
		
		
		
			
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				love to fish 
			 
		
		
		
		
		
	
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