Looks like everything you need to install is included and works great to me as a secondary membrane for a water saving install. That said, there's no washer around the main cap, and I was a little surprised it didn't leak when tightened by hand (I didn't even use the wrench that came with it). I would have preferred a washing machine so I can make sure it doesn't leak but it hasn't leaked in over a month so I'm happy.
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