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Welcome to The Sprinkler Channel. Glad you made it to this video because this is going to save you from having those annoying draining issues where water continues to seep out of the sprinkler head even after it is off and the wasp love this because they can use this mud to build their wasp nest. This is most common when you have a sprinkler head at the bottom of a sloped lawn area. We are going to explain how a simple part called a check valve could solve all your problems and how you could use your existing pop-up head and just add a check valve to your sprinkler head to solve the issue. Come along for the ride and let's learn something new!