The reason I mentioned the dot on the o-rings was the sheet to install the seals says to roll the o-rings on, don't slide them on. If you have never installed o-rings before, this is a big help being able to tell the o-ring is facing out. But yes, you are correct, the dot, color and hardness will tell what material they are made out of. All the o-rings I took out were the standard Buna N. The new ones were Buna N ,Viton and a blue o-ring material that I not figured out yet. Putting the new o-rings on was not a problem as I have messed with them many times before. The hardest one to get on was the single ring that goes on the end of the 2 spool valves. The biggest help to me was getting all the gaskets. That alone was worth the price of the kit.
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