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475ST

The Zurn Wilkins 475ST Stainless Steel n-Pattern Reduced Pressure Principle Assembly (RP) withstands the corrosive effects of water and is ideal for new or direct drop-in replacement delivering convenience without compromise.

To view all options, see the Specification Sheet - 475ST

Product Resources

BIM / 3D Models / 2D Drawings

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Features And Benefits

  • Superior stainless steel body to resist corrosion and extend the product life
  • Smaller footprint for direct drop-in replacement
  • Time-tested check and relief valve components ensure easy maintenace and more water system uptime
  • Patented compound checks provide ultra-low pressure drop as documented by approval authorities, reducing the need for a booster pump
  • Can utilize the new backflow setter which eliminates the need for concrete thrust blocks, allowing for easier installation and lower cost
  • Available as a 475STV for RP protection in a vertical upward flow path
  • Available in sizes 4"-10"
  • NRS Gate Valve Shut-offs (Standard)
Proportion 65
Lead Free
Retrofit or Replacement
Zurn Wilkins
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Repair Parts

Relief Valve Hose Kit, 6" and 10" used with RK6-RV475ST-HOSE. Kit Contains Sensing Tube, Elbow, and Nipple.

400STR to Standard Conversion Kit, 6" used with RK6-475ST-RVELBOW. Kit Contains O-Ring, Relief Valve, Relief Valve Elbow, O-Ring, Relief Valve Elbow, and Sensing Tube.

Standard to 400STR Conversion Kit, 6" used with RK6-475STR-RVELBOW. Kit Contains O-Ring, Relief Valve, Relief Valve Elbow, O-Ring, Relief Valve Elbow, Sensing Tube, Grooved Coupling, Body, and Spool.

#1 Check Assembly Repair Kit, 6" 450STDA used with RK6-450STCK4. Kit Contains Seat Retainer, O-Ring, Seat, Bolt, Poppet Retainer (x4), Handle, Poppet Assembly, Washer (x4), O-Ring, Retainer (x4), Poppet Retainer, Seal Ring, Seat Assembly, and #2 Poppet.

Relief Valve Hose Kit, 4" and 8" used with RK4-RV475ST-HOSE. Kit Contains Sensing Tube, Elbow, and Nipple.

400STR to Standard Conversion Kit, 4" used with RK4-475ST-RVELBOW. Kit Contains O-Ring, Relief Valve, Relief Valve Elbow, O-Ring, Relief Valve Elbow, and Sensing Tube.

Standard to 400STR Conversion Kit, 4" used with RK4-475STR-RVELBOW. Kit Contains O-Ring, Relief Valve,Relief Valve Elbow, O-Ring, Relief Valve Elbow, Sensing Tube, Grooved Coupling, Body, and Spool.

#1 and #2 Check Assembly Kit, 4" used with RK4-450STCK4. Kit Contains Seat Retainer, O-Ring, Seat, Bolt, Poppet Retainer (x4), Handle, Poppet Assembly, Washer (x4), O-Ring, Retainer (x4), Poppet Retainer, Seal Ring, and Seat Assembly.

Relief Valve Cover Repair Kit 8" and 10" used with RK8-RV-COVER. Kit contains Bolt, Cover (x6), Cover, and Sensing Tube Fitting.

Relief Valve Assembly Repair Kit, 8" and 10" 375DA used with RK8-RV-ASSY. Kit contains O-O-Ring, Relief Valve, Relief Valve Assembly, Bolt, Relief Valve (x2), and Sensing Tube Fitting.

400STR to Standard Conversion Kit, 8" used with RK8-475ST-RVELBOW. Kit Contains O-Ring, Relief Valve, Relief Valve Elbow, 475STDA, O-Ring, Relief Valve Elbow, and Sensing Tube (x2).

Relief Valve Elbow, 475ST to 475STR Conv. Kit, 8" 475STDAR and 475STDARelief Valve used with RK8-475STR-RVELBOW. Kit Contains O-Ring, Relief Valve, Relief Valve Elbow, 475STDAR, O-Ring, Relief Valve Elbow, Sensing Tube (x2)

#1 Check Assembly Repair Kit, 8" and 10" 475ST used with RK8-475STCK1. Kit Contains O-Ring, Seat, Bolt, Poppet Retainer (x6), Handle, Poppet Assembly, Washer (x6), O-Ring, Retainer (x6), Poppet Retainer, Seal Ring, Seat Assembly, #1 Poppet, Washer, Seat Retainer (x4), Nut, and Seat Retainer (x4).

#1 Check Assembly Repair Kit, 8" and 10" 450STDA used with RK8-450STCK1. Kit Contains O-Ring, Seat, Bolt, Poppet Retainer (x6), Handle, Poppet Assembly, Washer (x6), O-Ring, Retainer (x6), Poppet Retainer, Seal Ring, Seat Assembly, #2 Poppet, Washer, Seat Retainer (x4), Nut,  and Seat Retainer.

Relief Valve Complete Internals Repair Kit, 8" and 10" used with RK8-375RVCI. Kit Contains O-Ring, Upper Plunger, Upper Plunger, Diaphragm, Lower Plunger, Seal Ring, Seal Retainer, Washer, Bolt, Relief Valve Spring, Relief Valve Seat, O-Ring, Relief Valve Seat, and O-Ring, Relief Valve.

Complete Relief Valve Repair Kit, 8" and 10" used with RK8-375. Kit Contains O-Ring, Upper Plunger, Diaphragm, Seal Ring, Relief Valve Spring, O-Ring, Relief Valve Seat, and O-Ring, Relief Valve.

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