Stone sealer for slate mosaic table

I purchased a watts 3/4" double check backflow preventer valve for my irrigation system and I was wondering if someone can steer me in the right direction on how to install it. I am going to installing it inside my home right off of the water main. The ends of the valve are female threads. Do I just connect the water main to one end and copper out the output end with a shutoff valve?

Hello, I live in Minnesota. Last year's summer was dry and hot and my lawn went dormant early and really had some stress on it. We have a lawn service that sprays it and maintains it and it came back pretty good even though we really had to baby it all this year. The problem is that I have some areas/patches that didn't make it. We had frost and snow well into May and even June so I didn't have much of a planting season for those dead patches. Now is the time for us to plant some grass in those patches. I have top soil but need some advice what type of seed to use. Does anyone have any tips for growing grass in the fall? I usually mix the topsoil with seed, rake it in, and then cover it with that white growing cloth and have had pretty good results in the spring....is that going to work in the fall? If anyone has any comments/suggestions/methods they are greatly appreciated. Thanks Tripper