Sioux Chief 239 ABS Automatic ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$3.14
Sioux Chief 239 ABS Automatic Vent with 1-1/2" MIP Connection

Sioux Chief 239 ABS Automatic Vent with 1-1/2" MIP Connection

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Model: 239

In Stock (leaves warehouse same day if ordered before 3pm ET)

$3.14
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Sioux Chief 239 ABS Automatic Vent with 1-1/2" MIP Connection

The Sioux Chief 239 is an ABS automatic vent (air admittance valve) built for secondary venting on drain, waste, and vent (DWV) rough-in installations. It connects via a 1-1/2" MIP (male iron pipe thread) fitting and uses an internal sealing disc to admit air into the drain line, relieving negative pressure in the trap without cutting a dedicated vent stack penetration through the roof or an exterior wall. Because it opens and closes with pressure changes in the line, it lets a plumber vent a fixture that is too far from the main stack to vent conventionally. This vent is for secondary venting only — every drainage system must still have its own main vent stack — and it must be installed where it has free access to open air.

Key Features

  • Trade Size: 1-1/2" connection sized for standard DWV branch and fixture drain lines.
  • MIP Connection: Male iron pipe thread (MIP) fitting for direct threaded installation onto the drain line.
  • ABS Construction: Molded ABS body stands up to the everyday exposure of drain-line waste and sewer gases.
  • Secondary Venting Only: Engineered to supplement — never replace — the system's required main vent stack.
  • Sealing Disc Clearance: Internal sealing disc must be located at least 6" above the top of the trap arm for correct operation.
  • Accessible Location Required: Must be installed in a readily accessible location with free flow of air; never inside a sealed wall cavity.
  • Compact Footprint: Fits into cabinet bases, chases, and other tight spaces where routing a full vent stack is impractical.

Technical Specifications

  • Country of Origin: China
  • Packaging: 50 EA per case

Typical Applications

  • Secondary Venting for Island Sinks and Remote Fixtures
  • Residential and Commercial DWV Rough-In Plumbing
  • Renovation Projects Where a Full Vent Stack Run Is Impractical
  • Kitchen, Bath, and Laundry Fixture Drain Venting
  • Basement and Below-Grade Fixture Additions

Why Sioux Chief?

Sioux Chief builds the 239 automatic vent from ABS for corrosion-resistant performance in secondary drain-venting applications. Its threaded MIP connection and internal sealing disc give plumbers a straightforward way to vent hard-to-reach fixtures without opening a wall or roof for a new vent stack, provided it is installed in an accessible location with the proper 6" clearance above the trap arm and the drainage system retains its own main vent stack. That combination of simple threaded installation and a reliable sealing mechanism is why rough-in plumbers reach for the 239 on jobs where conventional venting isn't practical.

Manufacturer Resources

Sioux Chief Product Catalog

Product Specs

Product Type:
Automatic Vent
Connection Type:
Threaded
Department:
Plumbing
Product Group:
Rough-In and Supports
Product Subgroup:
Fittings and Valves
Product Material:
ABS
Product Size:
1-1/2"

Sioux Chief 239 – Frequently Asked Questions

1) Can a Sioux Chief 239 air admittance valve replace the main vent stack on a drainage system?
No. The Sioux Chief 239 is a secondary vent only. Every drainage system still needs its own main vent stack; the 239 supplements it so you can vent a fixture that sits too far from the stack to vent conventionally. Using one as the system's only vent is a misapplication.
2) How high above the trap arm does the Sioux Chief 239 automatic vent have to be installed?
The internal sealing disc has to sit at least 6 inches above the top of the trap arm. That is measured to the disc inside the valve body, not to the threaded connection, so allow for the body height when you set your riser length under an island sink or in a cabinet base.
3) Can I bury a 1-1/2 inch automatic vent inside a finished wall cavity?
No. The 239 has to be in a readily accessible location with free flow of air, never sealed inside a wall. It needs to draw open air to admit air into the drain line, and it has to stay reachable for service. Cabinet bases, chases, and vented access panels are the usual spots.
4) What size and type of connection does the Sioux Chief 239 vent thread onto?
It is a 1-1/2 inch MIP (male iron pipe thread) connection, so it threads directly into a female 1-1/2 inch FIP fitting or trap adapter on the drain line. No glue joint is needed at the vent itself, which is what lets you remove it later for inspection.
5) How does an automatic vent differ from a standard vent stack tee?
A vent stack tee is an open path to atmosphere; the 239 is a one-way air admittance valve with an internal sealing disc that opens under negative pressure to break the vacuum on the trap, then closes so sewer gas cannot come back out. That is why it can sit in a cabinet instead of running to the roof, and also why it can only serve as secondary venting.
6) What is the typical use case for the Sioux Chief 239 automatic vent?
Island sinks and other remote fixtures are the common one, along with basement or below-grade fixture additions and renovation work where running a new vent stack through the roof or an exterior wall is impractical. Kitchen, bath, and laundry fixture drains all fall in the 1-1/2 inch range it serves.
7) How many Sioux Chief 239 vents come in a case?
Case quantity is 50 each, which is how it ships for rough-in crews doing repeat multi-family or tract work. The orderable model number is 239.
How fast can I get the Sioux Chief 239 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Sioux Chief 239 come with a warranty?
Absolutely. The Sioux Chief 239 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Sioux Chief 239?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Sioux Chief 239 from ZenSupply?
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