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My water hammer sounds like a machine gun that bangs in the pipes at a frequency of about 3 or 4 times a second and the episode lasts about 20 seconds. It can be triggered by shutting off a faucet or sometimes it seems to start spontaneously. After an episode of hammering, nothing will cause it...

On the supply to my Furnace there is a Watts 1/2" 9D-M3 Backflow Preventer With Atmospheric Vent just before the pressure regulator. The backflow preventer has been leaking from the vent at the rate of about 2 drops per second. What's the cause and what's the cure?

I am considering a new toilet and the Toto Drake seems to fit the bill but I have a crucial question. What is the distance from the rim (not the seat) down to the water surface in the bowl? I have called several toilet manufacturers and they can't or won't tell me what seems to be a basic design...