37 Series Water Heater Vacuum Relief

Brand: Apollo Valves

Apollo® Model VR Vacuum Relief Valves is designed to automatically vent a system should a vacuum occur.

It prevents siphoning of water from the system and/or tank collapse
  • New Brass Poppet for Improved Strength
  • Sizes ½” and ¾”
  • Suitable for LP Steam (15 psig max)
  • Auto Vacuum Relief at Less than ½” Vacuum



  • Polished Chrome Finish
  • Satin Brass Finish
  • Heavy Spring
  • ½" Threaded Connection
  • ¾" Threaded Connection

Performance Rating

  • Maximum Pressure: 200 psig
  • Maximum Temperature: 250°F


  • Stainless Steel
  • ASTM B16 Brass
  • DZR C27541 Brass (Lead Free)
  • EPDM
  • Glass Filled Noryl


  • CSA 4.4/ANSI Z21.22 “Relief Valves for Hot Water Supply Systems”
  • NSF/ANSI 372 Lead Free
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