Perfect for my Tracker ProMariner 60hp 3 cylinder engine. 1994 Approval for vent plugs. The previous owner tightened this screw so much that I couldn't loosen it. I actually sanded it more than it was and had to buy a hand wrench as my 1/2" Dewalt Impact couldn't loosen the screw (http://www.amazon.com/Lisle-29200-Hand-Impact-Tool/ dp/B0002NYDRG < looks like this but was bought from the local True Value store for $6) true&ref_=cm_cr_ryp_prd_ttl_sol_4) for changing the fluid for the lower unit, I see that due to the forged steel used on them they don't last longer than a couple Replacements will hold up but I would definitely recommend them!
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