1 / 2Spears 439-422 Schedule 40 PVC Bushing, 4 in NPT Male x 3 in NPT Female
Spears Manufacturing 439 Series bushing reduces between two pipe sizes with male NPT threads on one end and female NPT threads on the other. Its PVC construction and Schedule 40 specification suit compatible cold-water pressure applications, but buyers should match the listed connection sizes and service conditions to their system.
At a glance
- Reducer bushing configuration connects pipes with different diameters and different thread ends.
- Listing describes compatibility with Schedule 40 PVC pipe and fittings and cold-water pressure distribution applications.
- Manufacturer claims chemical and corrosion resistance and a maximum operating temperature of 140 degrees F.
Reference price: $36.42
Price checked: Nov 14, 2026
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Pros and cons
Pros
- Male and female NPT ends provide a threaded transition between different pipe connection sizes.
- PVC construction is described as lighter than metal fittings and resistant to chemicals and corrosion.
- The listed potable-water certification and ASTM standards may be relevant for compatible plumbing applications.
Cons
- The stated 140 degrees F maximum operating temperature limits suitability for hotter service.
Technical specifications
15 specifications| Brand | Spears Manufacturing |
|---|---|
| Model | 439-422 |
| Series | 439 |
| Schedule | Schedule 40 |
| Configuration | 4" NPT Male x 3" NPT Female |
|---|---|
| Listed size | 4 x 3 Inch |
| Thread type | NPT |
| Connector type | Bushing |
| Dimensions listed | 6 x 4.7 x 2.3 inches |
| Weight listed | 7.2 ounces |
| Material listed | Polyvinyl Chloride |
|---|---|
| Color | White |
| Exterior finish | PVC, White |
| Maximum operating temperature | 140 degrees F |
| Standards and potable-water certification claim | Meets ASTM D1784 and D2466 standards for quality assurance, and certified by NSF International for potable water service |
What to know before buying
- Confirm that the 4-inch male and 3-inch female NPT connections, Schedule 40 compatibility, application, and temperature limit match the intended piping system. The standards and potable-water certification are listing claims, not independently verified here.
Who is it for?
A good fit for
- Plumbing or irrigation projects needing a 4-inch male NPT to 3-inch female NPT reducing bushing.
- Cold-water pressure systems using compatible Schedule 40 PVC fittings.
- Buyers seeking a white PVC threaded fitting for a specified pipe-size transition.
Less suited to
- Applications above the stated 140 degrees F maximum operating temperature.
- Projects requiring a different thread configuration, pipe size, or schedule.
Customer reviews on Amazon
- 5 stars
82% 82% - 4 stars
7% 7% - 3 stars
7% 7% - 2 stars
2% 2% - 1 star
2% 2%
Customer feedback describes the fitting as matching its advertised description, functional, and fitting well, with a reported pool-return use and positive value perceptions. That feedback is relevant if your required connection matches the listed 4-inch male to 3-inch female NPT layout, but it does not establish compatibility with every installation. Aggregate ratings are largely five-star, with a smaller range of lower ratings, and do not explain individual experiences.
Positive themes
- Customer feedback reports that the fitting works as expected and fits well.
- Feedback mentions functionality and perceived value positively.
Frequently asked questions
What connection configuration does this bushing have?
The listing identifies a 4-inch male NPT end and a 3-inch female NPT end.
What pipe system is it intended to fit?
The product description states compatibility with Schedule 40 PVC pipes and fittings. Confirm the sizes and thread details against the rest of the system.
Can it be used for hot water?
The listed maximum operating temperature is 140 degrees F. The supplied description presents it for cold-water pressure applications.
Is it certified for potable water service?
The listing claims NSF International certification for potable water service and cites ASTM D1784 and D2466. Treat these as manufacturer or listing claims and confirm they meet the requirements of your application.
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