The listed products include one 3/4-inch threaded-pipe assortment and four fittings with 3-inch or 4-inch connections, so check nominal size before choosing. The Supply Giant assortment is best for projects needing multiple 3/4-inch black nipples; the other options are better suited to larger threaded connections or diameter transitions. The comparison below highlights each product’s stated size and fitting type to help you avoid ordering the wrong size.
| Product | Stated size and type | Best suited for |
|---|---|---|
| Supply Giant OQCB3400 assortment | 3/4-inch black nipples | Projects needing assorted nipple lengths |
| Supply Giant OQCM3000 | 3-inch close nipple | Short connection between larger fittings |
| Spears 439 Series bushing | 4-inch male x 3-inch female | Reducing a threaded connection |
| Anvil 8700145900 | 3-inch NPT nipple, 4 inches long | Extending a larger threaded connection |
| TAISHER hex nipple | 3-inch male x 3-inch male | Corrosion-resistant larger connection |
Supply Giant 3/4-Inch Nipple Assortment
This is the only listed product explicitly sized for 3/4-inch threaded pipe. The assortment contains 66 black-coated nipples, with six of each size from 1 to 6 inches, according to the product details. It is best for DIY shelving or other projects that need several nipple lengths in the stated diameter.
Choose this if you need a range of 3/4-inch nipple lengths rather than one individual fitting. The product is an assortment of nipples, not a length of continuous pipe. Confirm that your project calls for 3/4-inch nominal fittings and that the black-coated finish and threaded-nipple format suit the intended use.
Supply Giant 3-Inch Close Nipple
This black-coated steel close nipple has a 3-inch nominal pipe diameter, male threaded ends, and a listed length of 2-5/8 inches. It is best for joining two female-threaded fittings that require a short 3-inch connection.
Its close-nipple format is the reason to choose it over a longer nipple when a compact connection is needed. It is not a 3/4-inch fitting, so avoid it if your project specification calls for 3/4-inch threaded pipe. Check the required nominal size and connection type before ordering.
Spears 4-Inch By 3-Inch PVC Bushing
This Schedule 40 PVC bushing has 4-inch NPT male threads on one end and 3-inch NPT female threads on the other. It is designed to connect different pipe diameters and is best for a compatible threaded transition between those sizes. The listed PVC features include chemical and corrosion resistance and lower weight than metal fittings.
Choose this when the required connection is specifically 4-inch male to 3-inch female NPT. It does not reduce to 3/4 inch, and the product details do not establish compatibility with every fluid or installation. Verify the system’s material and connection requirements.
Anvil 3-Inch NPT Steel Nipple
This 4-inch-long steel nipple has 3-inch male NPT threads on both ends and a black finish. It is best for joining two female-threaded 3-inch fittings or extending a connection where the specified nipple length is 4 inches. The product description identifies steel as offering greater rust resistance than iron.
Choose this over a close nipple when a longer 3-inch connection is needed. It is not a 3/4-inch fitting, and its male threads require compatible female-threaded connections. Confirm both the nominal diameter and required length before purchase.
TAISHER 3-Inch Stainless Steel Hex Nipple
This cast 304 stainless steel hex nipple has 3-inch male NPT threads on both ends. Its stated working-temperature range is -65 to 250 degrees F. It is best for a larger threaded connection where the listed stainless-steel material and temperature range fit the project requirements.
The hex shape distinguishes it from the other listed nipples, while the stainless-steel construction is stated to provide corrosion resistance. It is not a 3/4-inch option. The listing’s temperature range is not a substitute for checking suitability for a particular fluid, pressure, or installation.
Buying Guide: How To Choose Threaded Pipe Fittings
Does “3/4 threaded pipe” mean 3/4-inch nominal size?
Check the project specification and existing fitting labels. Pipe and fitting size is commonly stated as a nominal size; do not assume a measurement across the outside or inside diameter is the nominal size. Of these five listings, only the Supply Giant assortment explicitly states a 3/4-inch diameter.
Should you choose a nipple or a bushing?
A nipple is a short fitting with male threads, often used to join two female-threaded fittings or extend a connection. A bushing changes between different diameters and can have male threads on one end and female threads on the other. Match the fitting type to the connection you need to make.
How do you compare thread size and length?
Check nominal diameter, thread type, gender at each end, and nipple length. The listed 3-inch nipples have male NPT ends, but they differ in length and material. The Spears bushing has 4-inch male and 3-inch female NPT ends. These dimensions do not make any of them suitable replacements for a 3/4-inch fitting.
Which material should you consider?
The listings include black-coated steel, steel, PVC, and 304 stainless steel. Choose based on the project’s material and environmental requirements, and verify suitability for the intended service. The product descriptions provide some material characteristics, but they do not specify suitability for every application.
Frequently Asked Questions
Which listed product is sized for 3/4-inch threaded pipe?
The Supply Giant OQCB3400 assortment is listed as 3/4-inch diameter and includes 66 black-coated nipples in six lengths from 1 to 6 inches.
Are the 3-inch nipples interchangeable with 3/4-inch fittings?
No. The listings identify them as 3-inch nominal fittings, which is a different size from 3/4-inch fittings.
What does NPT mean in these product descriptions?
NPT refers to National Pipe Taper threads. Check that the fitting’s stated thread type and male or female ends match the connections specified for your project.
Which product is designed to connect different diameters?
The Spears bushing is listed for a 4-inch male NPT connection and a 3-inch female NPT connection. It is not a 3/4-inch reducer.
Is the 3/4-inch product a continuous pipe?
No. It is an assortment of threaded nipples in multiple lengths, not a continuous length of pipe.