Mercury 110 (9.8) Water pipe?

[Bunky67]

I pulled the power head off my 66 Mercury 110 (9.8 hp) to change the tiller handle bracket. When I was cleaning it I saw some nylon on the water tube coming up from the water pump. So I cleaned off some of the nylon. When going to reinstall the power head I needed some parts and looked on the parts diagram and saw there is supposed to be a nylon washer or spacer on top of the rubber around the top of the water tube. I picked one of the nylon washers but not exactly sure how it goes. Theres a flat side and a recessed side. Can someone tell me how this is suppose to go?