A sudden, drastic increase in shower water pressure is almost always caused by a failing pressure reducing valve (PRV) or a sudden spike in municipal water supply pressure. When the internal springs and rubber diaphragm inside your home's main PRV wear out, the valve stops regulating incoming pressure, allowing high municipal main pressure (sometimes exceeding 90 to 100 PSI) to surge directly into your home's plumbing pipes. Verification: Screw a pressure test gauge onto an outdoor hose bib to check if your system-wide PSI reading exceeds the safe 80 PSI limit.
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