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Q:I understand the O ring for the drain plug, but what gasket are they talking about when they say "change your O ring and gasket when chaanging the lower end lube"Asked on 4/6/2011 by Ken from South Bend, IN
A:Some lower unit use o-rings. Other use the fiber gaskets. I know on my 4-stroke 60 and 15HP motors, they both use the fiber gaskets.Answered on 3/14/2012 by John from WA
Q:what is the difference between #74253 & #74254 lower unit gear case plugs.Asked on 11/3/2009 by Anonymous from Clifford ,Pa.
A:They are both plugs, however one is magnetic and will attract any free roaming metal shavings or particles that can harm your engine.Answered on 11/4/2009 by Bob from Overton's Tech
Q:I have a 9.9 mercury outboard motor. i noticed that this kit has o-ring plus gasket in the kit. do i need a o ring along with gasket. as it only came with gasket when new.Asked on 5/13/2009 by wayne from saratoga springs ny
A:yuo only use one. some older mercs use the o-rings-my 07 4-stroke 25 hp. uses a gasket. mt from green bayAnswered on 4/28/2010 by mt from green bay