Women Owned Business Enterprise
RED-WHITE VALVE CORP.  |  SKU: 30078388  |  MPN: 9390N 1/4

Automatic Air Vent | 9390N Series | MNPT Brass Body

$17.80
Size | Connection Type | Min Order Qty (MOQ)
  • Reliable Automatic Air Venting – Designed to continuously release trapped air from hydronic systems, preventing airlock and system inefficiencies.
  • Rugged Brass Body with NPT Connection – Built from ASTM B283 C37700 brass for long-lasting durability; available in ¼", ⅜", and ½" MNPT.
  • High Temperature Compatibility – Withstands fluid temps up to 230°F (with anti-boil additives), ideal for high-performance closed loop systems.
  • Precision Engineered Components – Includes stainless steel spring, EPDM Perox seals, and polypropylene float to ensure consistent venting performance.
  • Compact and Lightweight – Low-profile design (under 3" height) fits tight installs; each size weighs only 0.34 lb, reducing strain on piping.
📄 Download data sheet

The 9390N Series Automatic Air Vent is engineered for efficient air release in hydronic heating and cooling systems. Designed with a solid ASTM B283 C37700 brass body and corrosion-resistant internal components, this compact vent ensures long-lasting reliability, even in high-temperature environments.

Ideal for preventing airlock and maintaining optimal flow, the 9390N vents trapped air automatically—eliminating the need for manual bleeding and reducing system maintenance.

✅ Key Features:

  • Durable Brass Construction
    Built with a high-performance brass body and vent (ASTM B283 C37700) for corrosion resistance and long life in closed-loop systems.
  • Automatic, Maintenance-Free Operation
    Reliably expels trapped air to prevent noise, pressure loss, and damage to pumps or heat exchangers.
  • Wide Temperature Compatibility
    Operates from 32°F to 230°F (above 212°F only with anti-boil fluid), making it suitable for both residential and commercial hydronic loops.
  • Compact & Lightweight Design
    Short profile (under 3") makes it easy to install in tight spaces; weighs just 0.34 lbs.
  • Multiple MNPT Sizes Available
    Offered in ¼" NPT, ⅜" NPT, and ½" NPT to suit your piping system.

💡 Ideal For:

  • Hydronic heating loops
  • Radiant floor heating
  • Fan coil units
  • Boiler piping systems
  • Solar thermal systems

Say goodbye to manual venting and system inefficiencies. The 9390N Automatic Air Vent is your plug-and-play solution for smooth, air-free operation in modern hydronic systems.

Dimension, Weight

Size Thread (N) A [in] D [in] H [in] Weight [lb]
¼" ¼" - 18 NPT 1.82 0.47 2.83 0.34
⅜" ⅜" - 18 NPT 1.82 0.47 2.83 0.34
½" ½" - 14 NPT 1.82 0.61 2.97 0.34

Material

Part Material Specification
Body Brass ASTM B283 C37700
Float Polypropylene1 -
Cursor Plastic -
Spring Stainless Steel AISI 304
Shutter Plastic -
Shutter Gasket EPDM Perox -
Vent Brass ASTM B283 C37700
Cursor Mount Stainless Steel -
O-ring EPDM Perox -
Tap Brass ASTM B283 C37700
Vent Cap Polypropylene1 -

1 For high temperature

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