Sioux Chief 633-312 3/4" FIP S...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$15.85
Sioux Chief 633-312 3/4" FIP Swivel x 3/4" Copper Sweat No-Lead DZR Coupling, 12" Length

Sioux Chief 633-312 3/4" FIP Swivel x 3/4" Copper Sweat No-Lead DZR Coupling, 12" Length

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Model: 633-312

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

$15.85
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Sioux Chief 633-312 3/4" FIP Swivel x 3/4" Copper Sweat No-Lead DZR Coupling, 12" Length

The Sioux Chief 633-312 is a 3/4" FIP swivel x 3/4" copper sweat coupling built for water heater connections and general rough-in plumbing work. This 12" length fitting is machined from No-Lead (NL), dezincification-resistant (DZR) brass, giving it the corrosion resistance needed for long-term potable water service. One end terminates in a female iron pipe (FIP) swivel connection that threads onto a male fitting without turning the attached tubing, while the opposite end is sized for a standard solder/sweat joint to 3/4" copper tube. Manufactured in the United States and packaged 25 pieces per case, it is intended for plumbing contractors stocking rough-in and water heater hookup materials.

Key Features

  • Trade Size: 3/4" FIP swivel inlet paired with a 3/4" copper sweat outlet, matched to standard 3/4" water heater supply and copper tube sizing.
  • Overall Length: Manufactured in a 12" length to reach across typical water heater connection points and tight rough-in cavities.
  • No-Lead DZR Brass Body: Formed from No-Lead (NL), dezincification-resistant (DZR) brass, a material selected to resist the zinc loss that can weaken standard brass fittings in aggressive water conditions.
  • Swivel FIP End: The female iron pipe (FIP) swivel connection rotates freely on the fitting body, so it can be threaded fully onto a male connection without twisting or stressing the copper tube on the opposite end.
  • Copper Sweat End: The opposite end is sized for a solder/sweat connection directly to 3/4" copper tube, allowing a standard torch-and-solder joint.
  • Threading Note: Sioux Chief instructs installers not to use pipe dope on the FIP swivel threads, helping the swivel seat and turn correctly during installation.
  • Domestic Manufacturing: Made in the United States.

Certifications & Compliance

  • No-Lead (NL) Compliant Construction
  • DZR (Dezincification-Resistant) Brass

Technical Specifications

  • Product Type: Coupling
  • Country of Origin: United States
  • Packaging: 25 EA per case

Typical Applications

  • Water Heater Rough-In Connections
  • Copper Tube to Threaded Fitting Transitions
  • Residential and Commercial Water Heater Installations
  • Potable Water Supply Line Connections
  • New Construction and Renovation Plumbing

Why Sioux Chief?

Sioux Chief builds this coupling from No-Lead, DZR-rated brass to withstand the demands of potable water rough-in work, and manufactures it in the United States. The FIP swivel end simplifies installation onto threaded connections without twisting the attached tubing, while the copper sweat end keeps the joint compatible with standard 3/4" copper tube, making this a dependable choice for water heater hookups and rough-in plumbing crews.

Manufacturer Resources

Sioux Chief Product Catalog

Product Specs

Country Of Origin:
United States
Cubic Volume:
0.372875
Product Type:
Coupling
Department:
Plumbing
Product Group:
Rough-In and Supports
Product Subgroup:
Fittings and Valves
Product Size:
3/4"

Sioux Chief 633-312 – Frequently Asked Questions

1) Will the Sioux Chief 633-312 coupling connect a 3/4 inch copper line to a water heater nipple?
That is what it's built for. One end is a 3/4 inch FIP swivel that threads onto a 3/4 inch male threaded connection such as a water heater nipple, and the other end is a 3/4 inch copper sweat socket for a soldered joint to 3/4 inch copper tube. Overall length is 12 inches, which lets it reach from the heater connection point out to where you pick up the copper.
2) What does the swivel end on this water heater coupling actually do for me on the install?
The FIP nut rotates on the fitting body, so you can tighten it down fully on the male thread without rotating the coupling itself. That matters because the far end is soldered to copper tube, a rigid non-swivel fitting would twist and stress that joint as you torque the thread. With the swivel you thread and seat the connection while the copper stays put.
3) Can I use pipe dope on the FIP swivel threads of the Sioux Chief 633-312?
No. Sioux Chief specifically instructs installers not to use pipe dope on the FIP swivel threads, the swivel needs to seat and turn correctly against the seal. Thread sealant there can interfere with that.
4) Is this brass coupling safe for potable water lines?
The body is machined from No-Lead (NL), dezincification-resistant (DZR) brass, which is the material spec used for long-term potable water service. The DZR rating means the alloy resists the zinc leaching that can weaken ordinary yellow brass in aggressive or high-chloride water. Typical uses are water heater hookups and potable supply connections in both residential and commercial work.
5) Do I have to solder this coupling, or is there a push-connect version?
The 633-312 has a sweat socket, so the copper side is a torch-and-solder joint to 3/4 inch copper tube. Keep in mind you're soldering close to the swivel end, so back the heat off the nut and its seal. If your crew is not soldering on the job, you would need a different fitting family altogether, this one only makes the copper connection with solder.
6) Is this coupling made in the USA for a Buy American spec job?
Yes, the 633-312 is manufactured in the United States, which is the detail that matters on government, school, and other domestic-preference jobs. Pair that with the No-Lead brass body when you're submitting it for potable water work.
7) Will a 12 inch coupling fit in a tight water heater closet?
The 633-312 is a fixed 12 inch overall length, chosen to span typical water heater connection points and rough-in cavities. If your clearance from the heater nipple to the copper drop is much shorter than that, you need a shorter fitting or a flex connector instead, this one does not shorten unless you cut the sweat end, which is not how it's meant to be used.
8) Is the Sioux Chief 633-312 sold individually or by the case?
It's packaged 25 each per case, aimed at contractors stocking water heater hookup and rough-in material rather than a one-off repair. Part number is 633-312.
How fast can I get the Sioux Chief 633-312 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 633-312 come with a warranty?
Absolutely. The Sioux Chief 633-312 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 633-312?
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 633-312 from ZenSupply?
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