Service Metal
300# Galvanized Malleable Reducing Couplings
- SKU:
- XGR
- Availability:
- Usually Ships Same Day
- Weight:
- 0.00 LBS
Description
300# Galvanized Malleable Iron Reducing Coupling
300# Galvanized Malleable Iron Reducing Couplings are designed to connect two different male-threaded pipe sizes in a straight run within higher-duty piping systems where added corrosion resistance is required.
Manufactured from durable malleable iron with a hot-dip galvanized finish, these Class 300 reducing couplings provide a compact threaded size transition for plumbing, waterworks, HVAC, mechanical, industrial, compressed air, and outdoor piping applications.
Product Highlights
- Reducing coupling configuration
- Female NPT x female NPT connections
- Connects two different nominal pipe sizes
- Maintains a straight in-line piping transition
- Designed for higher-duty Class 300 threaded piping systems
- Hot-dip galvanized finish for added corrosion resistance
- Durable malleable iron construction
- Malleable castings conform to ASTM A197
- Hot-dipped galvanized fittings conform to ASTM A153
- Malleable fitting dimensions conform to ASME B16.3
- NPT threads conform to ASME B1.20.1
- Class 300 fittings are UL Listed
- Suitable for water, air, HVAC, mechanical, and outdoor applications
- Approved to ANSI/NSF 61-4 Annex G and CA AB1953 (<0.25% lead)
- Manufactured in an ISO-certified facility
- Country of origin: Thailand & China
Technical Specifications
| Product Type | Reducing Coupling |
|---|---|
| Material | Malleable Iron |
| Finish | Hot-Dip Galvanized |
| Pressure Class | 300# |
| Connection Type | Female NPT x Female NPT |
| Configuration | Straight Reducing Coupling |
| Primary Function | Connect Different Male-Threaded Pipe Sizes |
| Casting Standard | ASTM A197 |
| Galvanizing Standard | ASTM A153 |
| Dimensional Standard | ASME B16.3 |
| Thread Standard | ASME B1.20.1 |
| Listing | Class 300 Fittings are UL Listed |
| Lead / Potable Water Compliance | ANSI/NSF 61-4 Annex G and CA AB1953 (<0.25% lead) |
| Manufacturing | ISO-Certified Facility |
| Country of Origin | Thailand & China |
Construction & Applications
Malleable Iron Construction
Manufactured from malleable iron castings conforming to ASTM A197 for dependable strength and durability in demanding threaded piping systems.
In-Line Size Reduction
The reducing coupling provides two different female NPT connection sizes, allowing a straight piping run to transition between different nominal pipe diameters.
Hot-Dip Galvanized Finish
The galvanized coating conforms to ASTM A153 and provides added protection against rust and corrosion in moisture-prone and outdoor environments.
Why Use a Reducing Coupling?
Compact Pipe Size Transition
A reducing coupling changes nominal pipe size within a straight run without requiring a separate coupling and bushing combination.
Female-to-Female Connection
Both ends are internally threaded, allowing male-threaded pipes of different nominal sizes to connect directly through the fitting.
Typical Applications
Mechanical & Commercial Piping
- Mechanical piping systems
- Commercial plumbing
- HVAC piping
- Water distribution
- Compressed air systems
- General utility piping
Galvanized & Outdoor Applications
- Outdoor piping
- Moist environments
- Waterworks installations
- Industrial piping
- General galvanized piping systems
Ask Willy: Need Pipe Size Help?
Use our common pipe diameters and wall thickness chart to confirm both connection sizes before ordering 300# galvanized malleable iron reducing couplings. You can also review the specification sheet and Certificate of Conformance below.
Standards & Approvals
ASTM Standards
Malleable iron castings conform to ASTM A197, while hot-dipped galvanized fittings conform to ASTM A153.
ASME Standards
Malleable fitting dimensions conform to ASME B16.3, while NPT threads conform to ASME B1.20.1.
UL & Lead Compliance
Class 300 fittings are UL Listed. Galvanized fittings are listed as meeting ANSI/NSF 61-4 Annex G and CA AB1953 requirements in the supplied product information.
Related Malleable Iron Standards
- Malleable bushings, plugs, and locknuts conform to ASME B16.14.
- Malleable unions conform to ASME B16.39.
- NPT threads on applicable fittings conform to ASME B1.20.1.
- Class 300 fittings are UL Listed according to the supplied product information.
Need More 300# Galvanized Malleable Iron Fittings?
Browse our complete selection of 300# galvanized malleable iron fittings, including reducing couplings, standard couplings, elbows, tees, bushings, unions, and other heavy-duty threaded fittings.
Frequently Asked Questions
What is a 300# galvanized reducing coupling used for?
It is used to connect two compatible male-threaded pipes of different nominal sizes in a straight run within a higher-duty piping system.
What type of connections does this fitting use?
The reducing coupling uses female NPT threaded connections on both ends.
How is a reducing coupling different from a standard coupling?
A standard coupling connects two pipes of the same nominal size. A reducing coupling has two different connection sizes so it can transition between different pipe diameters.
How is a reducing coupling different from a hex bushing?
A reducing coupling has female threaded connections on both ends. A conventional hex bushing typically has male threads on the outside and female threads on the inside.
Does the fitting change pipe direction?
No. A reducing coupling maintains a straight piping run while transitioning between different nominal pipe sizes.
Why choose galvanized instead of black malleable iron?
The hot-dip galvanized coating provides added protection against rust and corrosion in piping exposed to moisture, humidity, or outdoor conditions.
How is a 300# reducing coupling different from a 150# reducing coupling?
The Class 300 fitting is a heavier-duty fitting intended for more demanding threaded piping applications than a standard Class 150 fitting.
What standard applies to the galvanized coating?
Hot-dipped galvanized fittings conform to ASTM A153 according to the supplied product information.
What thread standard applies?
NPT threads conform to ASME B1.20.1.
Are Class 300 fittings UL Listed?
Yes. The supplied product information states that Class 300 fittings are UL Listed.
Important Ordering & Installation Notes
- Confirm both nominal connection sizes before ordering.
- Reducing coupling sizes are directional by size description, so verify which pipe size is required on each end.
- Both connections use female NPT threads.
- This fitting changes pipe size without changing pipe direction.
- Do not confuse a reducing coupling with a standard equal-size coupling or a male x female hex bushing.
- Confirm that Class 300 construction is appropriate for the intended piping system.
- NPT threads conform to ASME B1.20.1.
- Malleable fitting dimensions conform to ASME B16.3.
- Hot-dipped galvanized fittings conform to ASTM A153.
- Use compatible galvanized pipe, fittings, and thread sealant appropriate for the intended system.
- Avoid damaging the galvanized coating during handling and installation.
- Do not assume the “300#” class designation alone establishes allowable working pressure for every service condition.
- Verify pressure, temperature, media compatibility, potable-water requirements, applicable codes, and approval requirements before installation.
- Refer to the specification sheet and Certificate of Conformance for additional product information.
