450STDA

The Zurn Wilkins 450STDA Stainless Steel n-Pattern Double Check Detector Assembly (DCDA) withstands the corrosive effects of water and is ideal for new or direct drop-in replacement delivering convenience without compromise. For fire protection applications , with a metered by-pass to detect leaks and other water use.

To view all options, see the Specification Sheet - 450STDA

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 maintenance 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 in sizes 4"-10"
  • OS&Y Gate Valves (Standard)
  • Butterfly Valves (Optional)
  • Metered by-pass to detect leaks and other water use
Proportion 65
Lead Free
Retrofit or Replacement
Zurn Wilkins
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Repair Parts

Bypass Assembly, 450STR used with RK6-450STDAR-BP-LM.

#2 Check Assembly Repair Kit, 6" 450STDA used with RK6-450STDACK4. 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.

#2 Check Assembly Repair Kit, 6" 475ST used with RK6-450STDACK2. 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.

Bypass Assembly, 450ST used with RK6-450STDA-BP-LM.

#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.

Main & Bypass Rubber Repair Kit 6" 350DA used with RK6-350DA. Kit Contains O-Ring, Check (x2), O-Ring, Poppet Bolt (x8), Seal Ring (x2), and Bypass Rubber Repair Kit.

Bypass Assembly, 450STR used with RK4-450STDAR-BP-LM.

Bypass Assembly, 450ST used with RK4-450STDA-BP-LM.

#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.

Bypass Assembly, 450STR used with RK8-450STDAR-BP-LM.

#2 Check Assembly Repair Kit, 8" and 10" 475ST used with RK8-450STDACK2. 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, Nut, and Seat Retainer.

Bypass Assembly, 450ST used with RK8-450STDA-BP-LM.

#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.

Main & Bypass Rubber Repair Kit 8" - 12" 350DA used with RK8-350DA. Kit Contains O-Ring, Check (x2), O-Ring, Poppet Bolt (x12), Seal Ring (x2), and Bypass Rubber Repair Kit.

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