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Wilkins Winterizer Valve 1" FPT x 12" FPT | WKZW3-12-1F
Wilkins ZW3-12-1F 12 in. Backflow Winterizer Valve 1 in. FPT Outlet

Our Price: $376.20
Sale Price: $203.98
You save $172.22!

Product Code: WKZW3-12-1F

Description Reviews
Wilkins WKZW3-12-1F Backflow Winterizer Valve Assembly
Wilkins WKZW3-12-1F Backflow Winterizer Valve Assembly

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Product Information


The ZW3 is intended for any application where "Through the wall" water control is desired. Primarily intended for irrigation applications, the ZW3 valve provides outdoor access to an indoor water supply via a vandal resistant valve key. Some applications may include:

  • System Winterizing
  • System repairs
  • System isolation
Features & Benefits
  • Inlet: 3/4 in. FNPT x 1 in. MNPT
  • Outlet: 1 in. FNPT
  • Maximum working pressure 175 PSI
  • Maximum working water temp. 140 F
  • 3/8 in. Vandal resistant valve hex key
  • Integral rectangular cover plate with mounting with mounting holes
  • 1/2 in. drain and plug
Winterizing Instructions
  1. Fully close the Winterizer shut off with the control key by turning the key fully clock-wise.
  2. Remove the 1/2 in. drain plug from the outlet casting.
  3. Drain the water from the system. Allow for complete air drying of the system piping, and backflow preventer.
  4. If preferred regulated compressed air can be used to blow down any moisture within the piping system.
  5. When satisfi ed with the moisture removal from the piping system, re-install the 1/2 in. drain plug into the winterizer valve. This concludes the winterizing procedure.
Wilkins ZW3 Winterizer Valve Assembly Dimensions
Installation Instructions
  1. Drill a 2 in. diameter hole into the wall and insert the inlet end through the wall.
  2. Connect the inlet piping to the inlet tailpiece . Allow for a ball valve or other shut off device to be on the inlet source side of the Winterizer. When using copper sweat components for the inlet connection make sure the Winterizer is fully open by turning the inlet hex with the control key fully counter clockwise until the key stops.
  3. Determine the system requirements for the Winterizer. (i.e. Pressure Vacuum Breaker, Reduced Pressure Principle Backflow Preventer or Double Check Backflow Preventer)
  4. Secure the Winterizer to the wall using the cast baseplate on the unit. Suggested size of the fasteners is 1/4 in. diameter at 4 each for fastening the corners of baseplate.
  5. Close the winterizer with the control key by turning the key clockwise.
  6. Turn on the inlet supply shut-off valve to the Winterizer.
  7. Slowly open the Winterizer with the control key and flush the system of any debris. Make sure that the Winterizer is fully open until the key stops.

Note: The winterizer is not designed to be a throttling control valve. It should be either fully open or fully closed.

For complete instructions, click here.

Typical Installation
Wilkins ZW3 Winterizer Valve Assembly Typical Installation
Wilkins ZW3 Winterizer Valve Assembly Diagram
Wilkins ZW3 Winterizer Valve Assembly Flow Characteristics
Click image above to enlarge

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