Roy A Dayton , OH May 04, 2015 Appliance: General Electric Uc Filtration-Carbon PNSF39Z01 Ge Water Softener Pnsf39z01: Water softner shut off valve leaking. How to replace Bypass Valve Assembly (Water Softener). Purchased new shut off valve. Took care of problem Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes