Boshart SS304RC 304 Stainless Steel Reducing Coupling

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.