This is an exact replacement for an old broken Watts regulator. However, only one O-ring is included. I need to reuse one of my old o-rings and it's leaking a bit. Emailed Watts and got an O-ring in the mail a few days later. It should have two O-rings. Many of them are only used for replacement and not for reinstallation. Two o-rings make life a lot easier, and the added cost of one o-ring can be as little as pennies.
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