I used bushings and had a JG fitting that screwed into the bushing. Worked fine for years. The JG ball valves are not the best for fine adjustments. I used to run my reactor wide open so it wasn't an issue. Now I don't run a reactor and I sleep better at night...  LoL. 
 
Cheers, 
Tim 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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