Boshart SS304RC 304 Stainless ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1.33
Boshart SS304RC 304 Stainless Steel Reducing Coupling

Boshart SS304RC 304 Stainless Steel Reducing Coupling

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Model: SS304RC-0201

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

$1.33
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Boshart SS304RC 304 Stainless Steel Reducing Coupling

The Boshart SS304RC is a family of reducing couplings machined from 304 stainless steel and manufactured to the ISO4144 thread standard, giving rough-in plumbers and contractors a dependable way to step down between two threaded stainless steel pipe sizes on a single run. This coupling is available in a range of reducing configurations, from 1/4" x 1/8" up through 3/4" x 1/2" and 1-1/4" x 1", so installers can select the exact transition size their run requires while relying on the same 304 stainless steel construction and ISO4144 thread geometry across the entire size range. Because every size in this family is 304 stainless steel throughout, the coupling is well suited to installations where corrosion resistance and long-term joint integrity matter more than a low-cost carbon steel or malleable iron alternative. The ISO4144 designation tells the installer that the threading geometry on these couplings is built to a recognized international standard, which is useful when matching stainless steel fittings from different production runs or when working on equipment specified to metric/ISO thread conventions rather than NPT.

Key Features

  • Trade Size Range: Available in reducing configurations from 1/4" x 1/8" through 1-1/4" x 1" for stepping down between two threaded stainless steel pipe sizes on the same line.
  • Durable Construction: Machined from 304 stainless steel for corrosion resistance and long service life in threaded piping systems.
  • Thread Standard: Manufactured to ISO4144 for consistent thread geometry when mating with other ISO-standard stainless steel fittings, across every size in the range.
  • Reducing Coupling Design: Provides a single-piece transition fitting rather than requiring a bushing-and-coupling workaround, in each available size.
  • Case Packaging: Supplied in case quantities suited to stocking shelves and service inventory for stainless steel fittings of this type.
  • Recommended Sealant Pairing: Boshart recommends using Gray Stainless Steel PTFE Tape together with Gray Magic Pipe Thread Compound when joining stainless steel threaded fittings of any size in this family.

Technical Specifications

  • Country of Origin: China
  • Prop 65 Warning: No

Typical Applications

  • Threaded Stainless Steel Pipe Rough-In
  • Reducing Between Two Threaded Pipe Sizes on a Single Run
  • Corrosion-Resistant Piping Systems
  • Service Truck and Distributor Stock for Small Stainless Fittings
  • Repair and Retrofit of Existing Stainless Steel Threaded Lines

Why Boshart?

Boshart builds this reducing coupling family from solid 304 stainless steel and machines every size to the ISO4144 thread standard, giving installers a fitting they can trust to hold a consistent, corrosion-resistant joint over time regardless of which reducing size the job calls for. Pairing the coupling with Boshart's recommended Gray Stainless Steel PTFE Tape and Gray Magic Pipe Thread Compound helps ensure a properly sealed threaded connection at install. For plumbers and contractors who need a reliable stainless steel transition fitting they can stock in volume across multiple sizes, the Boshart SS304RC family delivers consistent quality backed by case-pack availability.

Manufacturer Resources

Product Specs

Prop 65 Warning:
No
list_batch:
BOS-20260923
Product Type:
Reducing Coupling
Standards:
ISO4144
Department:
Plumbing
Product Subgroup:
Fittings and Valves
Product Material:
Stainless Steel
Product Group:
Fitting

Boshart SS304RC-0201 – Frequently Asked Questions

1) What sizes does the Boshart SS304RC stainless reducing coupling come in?
Three reducing combinations are offered: 1/4 x 1/8 inch (SS304RC-0201), 3/4 x 1/2 inch (SS304RC-0705), and 1-1/4 x 1 inch (SS304RC-1210). Each steps a threaded run down one size in a single fitting, so there is no size between 1/2 and 3/4 or above 1-1/4 in this family. All three are the same 304 stainless construction and the same ISO4144 thread geometry.
2) Will an ISO4144 threaded coupling screw onto NPT pipe?
The SS304RC reducing coupling is machined to the ISO4144 thread standard, not NPT. ISO4144 covers the ISO 7 / R-Rc tapered pipe thread convention used on metric-specified stainless systems. If your existing run is cut NPT, match it with an NPT fitting instead, or use a proper thread adapter at the transition. Mating ISO threads to NPT is where leaks start, and no amount of tape fixes it.
3) Do I need a bushing to reduce from 3/4 to 1/2 inch stainless pipe?
Not with this fitting. The 3/4 x 1/2 inch SS304RC is a one-piece reducing coupling with female threads at both ends, so it makes the step down in a single joint instead of a full-size coupling plus a hex bushing. That is one less threaded connection to seal and less makeup length to find in a tight rough-in.
4) What thread sealant should I use on stainless steel threaded fittings like these?
Boshart's recommendation for the SS304RC is Gray Stainless Steel PTFE Tape used together with Gray Magic Pipe Thread Compound. Stainless threads gall easily against each other, and that tape-plus-compound combination lubricates the makeup as well as sealing it. Plan on stocking both if you are running stainless threaded pipe.
5) Is 304 stainless the right choice for this coupling, or should I use malleable iron?
304 stainless is what the SS304RC is machined from, and it is the reason to pick it over a malleable iron or carbon steel coupling: corrosion resistance and long-term joint integrity in wet, washdown, or chemically aggressive lines. On an ordinary dry interior gas or hydronic run where corrosion is not the concern, malleable iron does the same mechanical job. Choose the stainless where the environment, not the pressure, is the problem.
6) Which part number do I order for a 1-1/4 to 1 inch stainless reducing coupling?
SS304RC-1210 is the Boshart 1-1/4 x 1 inch 304 stainless reducing coupling, and it is the largest reduction in the family. Threads are ISO4144.
7) Does the Boshart stainless reducing coupling carry a Prop 65 warning?
No Prop 65 warning applies to the SS304RC reducing coupling. It is 304 stainless steel throughout and is made in China. That matters to institutional and municipal buyers who screen fittings before they go into a building.
8) Can I buy Boshart SS304RC couplings by the case for truck and shelf stock?
Yes, the SS304RC reducing couplings are supplied in case quantities intended for distributor shelf stock and service truck inventory. Each size is a separate part number (for example SS304RC-0201 for 1/4 x 1/8 inch), so stock the reducing combinations your crews actually run rather than the whole family.
How fast can I get the Boshart SS304RC-0201 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 Boshart SS304RC-0201 come with a warranty?
Absolutely. The Boshart SS304RC-0201 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 Boshart SS304RC-0201?
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 Boshart SS304RC-0201 from ZenSupply?
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