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Small cylindrical stainless steel coupler with female NPT threads

SPEEDAIRE

SPEEDAIRE 30E539 Coupler Body 3/8 NPT 304 SS

SKU CH-MDSX-DBPP5

Quick-connect hose coupling with 3/8 NPT female thread, 304 stainless steel body, poppet valve, nitrile seals and 400 psi rating

  • Tool-free push-to-connect operation speeds air-line changes
  • Universal 3/8 in NPT thread fits ARO, Industrial and Automotive plugs
  • 304 stainless steel body resists corrosion in harsh environments
  • 400 psi rating at 70°F handles demanding compressed-air systems
  • 40°F to 200°F operating range suits extreme temperature conditions

Quick-connect coupler body for 3/8 NPT lines

The SPEEDAIRE 30E539 is a 304 stainless steel coupler body with a female 3/8 in NPT thread designed for push-to-connect attachment of ARO, Industrial or Automotive interchange plugs. It serves workshops and mobile service rigs that need tool-free hose changes on compressed-air systems rated up to 400 psi at 70°F. An integrated poppet valve and nitrile seals handle air flow up to 1,274.26 lpm across a temperature range of -40°F to 200°F.

Thread-in installation with universal plug fit

Installation is a simple matter of threading the 3/8"-18 NPT end into a matching port using standard pipe sealant; no special tools are required for the push-to-connect locking mechanism once the body is secured. The universal interchange design accepts three common plug profiles, reducing the chance of mismatch, but installers must confirm the mating plug type before pressurising the line. Over-tightening the taper thread or using worn plugs are the most frequent causes of leaks.

Sustained flow at rated pressure and temperature

Under continuous operation the coupler maintains its 400 psi working pressure limit at 70°F, and the 304 stainless body resists corrosion from moisture in the air stream. The nitrile seals and poppet valve remain functional throughout the -40°F to 200°F envelope, so performance does not degrade during extended duty cycles in cold or hot environments. Flow capacity stays at the rated 1,274.26 lpm provided the supply system can deliver it.

Highlights

  • Tool-free push-to-connect operation speeds air-line changes
  • Universal 3/8 in NPT thread fits ARO, Industrial and Automotive plugs
  • 304 stainless steel body resists corrosion in harsh environments
  • 400 psi rating at 70°F handles demanding compressed-air systems
  • 40°F to 200°F operating range suits extreme temperature conditions

Specifications

BrandSPEEDAIRE

Questions about this item

How do I verify the SPEEDAIRE 30E539 coupler is sealing correctly after installation?

Pressurise the line to its 400 psi rating at 70°F; the integrated poppet valve should hold pressure with no audible leak at the 3/8"-18 NPT threads or the push-to-connect sleeve.

What comes with the SPEEDAIRE 30E539 and what must I supply?

The box contains only the 304 stainless steel coupler body with nitrile seals; you must provide a matching ARO, Industrial or Automotive interchange plug and thread sealant for the 3/8"-18 NPT connection.

Which SPEEDAIRE 30E539 variant should I choose for my application?

This single part number covers the 3/8 in female NPT, 304 stainless steel, universal-interchange body rated for 400 psi at 70°F and -40°F to 200°F; select it when those exact specifications match your system requirements.

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