Re: Piston not working in one direction any more
			 
			 
			
		
		
		
			
			Any correct size oring will work, only thing you have to be concerned (aside from correct size) is if it is acceptable for oil applications. Black is usually oil application.  
http://www.mcmaster.com/#o-rings/=1050a31
Metric sizes also.
		  
		
		
		
		
		
		
			
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