A Female Reducing Bushing with a Male Spigot x Female NPT configuration is a specialized PVC fitting designed to adapt a larger socket or hub to a smaller FNPT (female-threaded) outlet. This type of fitting—sometimes informally referred to as a female reducing ring—features a male spigot end that fits into a socket or hub, and an internal female National Pipe Thread (FNPT) connection that accepts a smaller-diameter male-threaded pipe or fitting.

Functional Overview:

  • Male Spigot End: Mimics plain-end pipe and is intended for solvent welding into another socket fitting (like a tee, elbow, or coupling).
  • Female NPT End: Accepts male-threaded PVC, CPVC, brass, or stainless steel pipe or components.

Primary Purpose:

To allow a reduction in threaded size inside a socket fitting without adding bulk or unnecessary transitions. It’s a clean and space-saving solution for downsizing from a large hub to a smaller FNPT thread connection.

Example Application:

Let’s say you have a 3" Schedule 40 coupling and need to connect a 1" threaded ball valve. Instead of using a full-size bushing or multiple reducers, you can solvent weld a 3" spigot x 1" FNPT female reducing bushing into the coupling and thread in the 1" valve directly.

Key Features:

  • Precision-molded for high-pressure performance (SCH40 or SCH80 options available)
  • Chemically resistant to most acids and alkalis
  • Compatible with potable water systems (NSF certified where applicable)
  • Meets ASTM D2466 (SCH40) or ASTM D2467 (SCH80) standards
  • Compact and efficient alternative to bulky reducing fittings

Common Uses:

  • Irrigation manifolds and riser lines
  • Greenhouse and hydroponic water systems
  • Pool and spa plumbing
  • Industrial water filtration
  • Aquaponic fish tank systems
  • Anywhere space is limited but a threaded connection is needed

Also Known As:

  • Female Reducing Ring (informal or contractor slang)
  • FNPT Reducing Insert
  • Threaded Reducing Bushing (Spigot x FNPT)
  • Slip Insert to Threaded Reducer
  • Spigot to FNPT Adapter Ring

Why Choose 247Garden PVC Fittings?

At 247Garden, we offer a complete line of Schedule 40 and Schedule 80 PVC Female Reducing Bushings in spigot x FNPT configurations. Our fittings are:

  • Made from virgin PVC resin for strength and chemical resistance
  • Backed by ASTM and NSF compliance, ensuring suitability for drinking water, irrigation, and industrial use
  • Offered in a variety of sizes to match your system’s needs
  • In stock and ready to ship, with fast, free shipping across the mainland USA
  • Priced competitively with bulk quantity discounts available

Whether you’re retrofitting a manifold or building a brand-new PVC system, 247Garden has the fittings to keep your build clean, compact, and reliable.

Need help selecting the right spigot x FNPT reducer for your project? Contact us for expert recommendations.

Purpose and Function:

  • Reduces a larger socket or hub to a smaller FNPT (Female National Pipe Thread) connection
  • Converts socket-to-threaded transitions without needing a full bushing or coupling
  • Ideal for tight spaces where a bulky reducing bushing is not practical
  • Compatible with Schedule 40 or Schedule 80 PVC fittings and pipes, depending on the specific product

Example:

You have a 3-inch socket tee but need to connect a 1-inch male-threaded riser. A 3" to 1" Female Reducing Ring allows you to insert the ring into the 3-inch socket and then thread the 1-inch male fitting directly into it—no additional reducer bushing required.

Key Features:

  • FNPT threads on the inside for direct connection with male-threaded pipe or fittings
  • Smooth outer wall designed for solvent welding (PVC primer and cement required)
  • More space-efficient than traditional reducer bushings
  • Pressure-rated depending on the material and design (typically matches SCH40 or SCH80 ratings)
  • Manufactured to meet ASTM and NSF standards where applicable

Common Applications:

  • Agricultural irrigation systems
  • Swimming pool and spa plumbing
  • Greenhouse water management
  • PVC manifolds and control valves
  • Chemical-resistant fluid systems (depending on material type)

Other Names You May Encounter:

  • FNPT Reducing Ring
  • Threaded Reducing Insert
  • Female Threaded Reducer Ring
  • PVC Threaded Adapter Ring
  • Reducer Thread Insert (Female)
  • Reducing Threaded Sleeve

At 247Garden, our Female Reducing Rings are precision-molded for secure, reliable connections and are ideal for both residential and commercial applications. Whether you're building a custom PVC manifold or retrofitting an existing line, these rings offer a low-profile solution for threading down to smaller pipe sizes. If you need female reducing bushings, check us out! We stock and ship from Los Angeles. Call us 323-318-2600 if you have any questions!

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