If you need a continuous 20-foot length of 1½-inch galvanized pipe, none of the listed products is described as a 20-foot pipe: the longest stated length is 30 inches. The options below may suit shorter sections or extensions, but they are not direct substitutes for a 20-foot length. The 30-inch pre-cut pipe is the closest listed option by length; the other selections are shorter fittings or an extension with different material and finish.
| Product | Stated length | Best fit |
|---|---|---|
| SUPPLYGIANT PCGL1530 | 30 inches | Longest listed pre-cut galvanized section |
| Galvanized double-ended threaded pipe | Up to 20 inches | Short threaded extension |
| Everflow PCGL1518 | 18 inches | Short pre-cut pipe section |
| Supply Giant OQHM1512 nipple | 12 inches | Short threaded connection |
| APPROVED kitchen extension | 12 inches | Slip-connection kitchen drain extension, not galvanized pipe |
SUPPLYGIANT 30-Inch Galvanized Pipe
Best for: Buyers who need the longest stated pre-cut galvanized section in this group. The product information identifies it as a 30-inch pipe with a 1½-inch nominal diameter, part number QDHM1530.
Choose this if a 30-inch section suits the project and you want a pre-cut galvanized pipe. It is more relevant to a long-run project than the shorter options, but it is still only 2½ feet long—not 20 feet.
Limitation: The supplied details do not specify end threading or provide enough information to confirm whether this section matches a particular connection. Check the product listing and project requirements before ordering.
Double-Ended Galvanized Threaded Extension Pipe
Best for: Buyers needing a short threaded extension rather than a long continuous pipe. The listing describes galvanized steel construction, double-ended threads, diameter choices from ½ to 2 inches, and extension lengths from 4 to 20 inches.
Choose this if the required connection calls for a threaded extension and the chosen size and length fit the installation. The maximum listed length is 20 inches. Although the product name includes a 1.5-inch inside-diameter option, verify the selected option’s exact nominal size and dimensions before purchase.
Limitation: A 20-inch extension is not a 20-foot pipe. The supplied details do not identify a specific pipe schedule or confirm suitability for a particular plumbing or gas system.
Everflow 18-Inch Pre-Cut Galvanized Pipe
Best for: Buyers who need a short, pre-cut 1½-inch nominal galvanized pipe section. The listed details give an 18-inch length and Supply Giant part number QDHM1518.
Choose this if an 18-inch piece fits the required span or assembly. It is a clearly specified galvanized option for a small section, but it is substantially shorter than a 20-foot run.
Limitation: The product details do not state the end type or provide further dimensions. Confirm connection requirements and whether the stated nominal diameter matches the project specification.
Supply Giant 12-Inch Galvanized Nipple
Best for: Buyers needing a short threaded fitting for a 1½-inch nominal pipe connection. The listing describes a 12-inch galvanized steel nipple with male threaded ends and a stated size of 1½ by 12 inches.
Choose this when the project specifically needs male threads at both ends and a 12-inch nipple. Its listed end detail makes it easier to compare with the unthreaded or unspecified-end pre-cut sections.
Limitation: This is a 12-inch fitting, not a long pipe section. The supplied details do not identify thread standards, so verify that the threads match the mating components.
APPROVED 12-Inch Kitchen Pipe Extension
Best for: Buyers comparing a short kitchen pipe extension, not shoppers seeking galvanized steel. The listing describes a 12-inch, 20-gauge brass extension with a chrome/brass finish, 1½-inch pipe diameter, slip connection, and included nut and washer.
This item is included because its stated diameter is 1½ inches, but its material and connection type make it a different category from galvanized threaded pipe. Choose it only if a brass kitchen extension with a slip connection is what the installation calls for.
Limitation: It is not galvanized steel and should not be treated as a substitute for a galvanized pipe run.
Buying Guide: Choosing Pipe for a 20-Foot Run
Do you need one continuous 20-foot length?
None of these product descriptions identifies a 20-foot-long pipe. The listed lengths are 12, 18, 20, and 30 inches. If the project requires one continuous 20-foot section, look for a listing that explicitly states a 20-foot length and the required 1½-inch nominal size. Do not infer a 20-foot length from a product title that mentions a 20-inch option.
Does nominal size match your measurements?
Pipe listings may distinguish nominal size from inside or outside diameter. These supplied details use “1½-inch nominal” for several products, while the threaded extension listing refers to a 1.5-inch inside-diameter option. Compare the exact dimension and product variant with the project specification instead of relying on similar wording alone.
Which end connection do you need?
The 12-inch nipple is specifically described as having male threaded ends. The double-ended extension is described as threaded, while end details for the two pre-cut pipes are not provided. The APPROVED extension uses a slip connection. Check the required connection type and thread details before choosing a fitting.
Is galvanized steel required?
For a galvanized pipe project, prioritize products explicitly described as galvanized steel. The brass kitchen extension is a different material and connection style. For plumbing or gas applications, confirm that the product is appropriate for the intended system and follow applicable local requirements; the supplied descriptions do not establish approval for a particular installation.
Frequently Asked Questions
Is any listed product a 20-foot galvanized pipe?
No. The longest stated length is 30 inches. The double-ended extension reaches 20 inches, which is not 20 feet.
Which listed option is longest?
The SUPPLYGIANT PCGL1530 is listed as a 30-inch pre-cut galvanized pipe with a 1½-inch nominal diameter.
Which option has male threaded ends?
The Supply Giant OQHM1512 is described as a 12-inch galvanized steel nipple with male threaded ends.
Is the APPROVED extension galvanized?
No. Its listed material is brass, and it uses a slip connection. It is not a galvanized steel pipe substitute.
What should I verify before ordering?
Confirm the actual length, nominal and measured diameter, material, end connection, and compatibility with the intended installation. The supplied details do not answer every specification question.