Hello Davephan,
If your household water pressure is 120 PSI, you need to replace your homes water regulator. Your household water pressure should be nowhere near that high. It should be under 90 PSI max. Most city codes specify the water regulator be set at 55-75 PSI (our city code says 60 PSI). They should be replaced about every 3-4 years. Their easy to install and I have done ours a few times.
Our household RO system is in the garage, and if the PSI is to high it can cause the RO system to leak or even be cracked. We found out our water pressure was to high when we first saw leaking from the RO system water lines. It was easily fixed, but the cause was the faulty household water pressure regulator. If you want a secondary water regulator to protect the RO system that's fine. But you still need to fix the household water pressure regulator. If you want to test your household water pressure, they sell pressure testers for under $10 and are simple to use. You just take off the garden hose and screw it onto the outside water faucet, then turn the water on. The gauge will tell you what the water pressure is.
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