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I know the picture shows 4 and 5 but the balls sit below this spot between 5 and 6.

At the top of level 6 are two columns " separated" At the top of level 6 are two "columns" or posts that look like a ball would sit on it. They are a simple check valve is all.

I also thought it was for water restriction conservation until I read the invention patent. Pretty clever thinking. Not for water conservation at all. Basically its intentions are for when you are drawing a bath, excess water pressure doesn't send water up the pipe to the shower head by way of...