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Regular pressure hand to peak operating or surge pressure point where it remains until you manually reset it. Excellent to determine if P/T valve is leaking from failure or if leaking is caused by surge or excessive pressures (gauge attached to boiler drain overnight) lazy hand operates over entire gauge range.
PASCO 1428 Water Test Gauge, 2 in Dial, 0 to 300 psi, 3/4 in