I bought this unit to fix the water hammer that occurs when my sprinkler timer goes off. Seems to work as advertised. It's easy to install and looks solid. I had an issue with water leaking around the inlet. My setup is a bit like Ruby Goldberg's, but nothing that detracts from the tight connection. I fixed it by replacing the small black hose washer with a new one I had on hand. I don't know what the problem is, there are no visible flaws.
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