The check-valve has one nipple on one end that connects to the hose going to the pump and 2 nipples on the other end that go to each spray nozzle. Most washer problems are due to the nozzles being clogged. New ones at the dealer are very cheal. Remember to get new 90 degree elbows that connect to the nozzles also. They will break when you try to remove them. The nozzles are easliy removed by depressing 2 tangs on the back side of the nozzles with a pair of needle nose pliers and the news one simply snap in place from the top side of the hood. Might as well replace all of the hose while you are at it. Its cheap too. I would recommend that you remove the washer fluid tank and clean it out. I put mine in the dish washer. Be sure to remove the pump before you wash the tank and replace the rubber grommet where the pump snaps into the tank. The whole project is very inexpensive and easy to do. Good luck, Cliff