This is an exact replacement for the leaking bypass valve on my Fleck softener valve. Installation took 10 minutes including shutting off the water in my system and draining the connecting lines. The bypass valve is clamped between the inlet/outlet manifold and the flow meter, it is enough to release the two pawls on each side, after which each component can be separated; they are connected to each other and sealed with O-rings. I believe the o-ring on my old valve was defective, that would probably be a cheap fix but locating the o-rings would take a lot of time and effort. For $23 it was a quick and permanent fix.
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