What You Need to Know Before Buying 3/4 PEX Pipe
If you’re looking into 3/4 inch PEX pipe options, here’s a quick summary of common choices and what to expect:
| Product | Type | Length | Price | Price/ft |
|---|---|---|---|---|
| White PEX-B Coil | PEX-B | 100 ft | Varies by brand and market | Varies |
| Blue PEX-B Coil | PEX-B | 100 ft | Varies by brand and market | Varies |
| White PEX-A Coil | PEX-A | 100 ft | Typically higher than PEX-B | Varies |
| Blue PEX-B Coil | PEX-B | 10 ft | Higher per-foot cost than full coil | Varies |
| White PEX-B Bulk Coil | PEX-B | 300 ft | Better value for larger jobs | Varies |
Key things to know:
- Standard Plumbing Supply carries a range of 3/4 inch PEX pipe and related fittings for residential plumbing projects
- PEX-A uses expansion fittings; PEX-B uses crimp or clamp fittings
- White PEX works for both hot and cold water lines
- Lengths range from short repair pieces to large coils depending on your project size
3/4 inch PEX pipe is one of the most practical choices for residential plumbing today. It’s flexible, affordable, and far easier to work with than copper or rigid PVC. Whether you’re replumbing a home, adding a bathroom, or running new supply lines, 3/4 inch PEX is the workhorse size – large enough for main supply runs, small enough to maneuver through tight spaces.
But with dozens of products across multiple types, colors, and brands, finding the right pipe for your specific project takes a little know-how.
At Standard Plumbing Supply, we help homeowners and contractors compare 3/4 inch PEX options for repairs, remodels, and full repipes. With locations across Arizona, California, Colorado, Idaho, Nebraska, Nevada, Oregon, Utah, and Wyoming, our knowledgeable staff can walk you through the differences in person. In the sections below, we’ll break down exactly what to look for so you can make a confident, cost-effective choice. For a general overview of the material itself, see PEX on Wikipedia.
Understanding 3/4 PEX Pipe and Its Uses
When we talk about 3/4 inch PEX, we are referring to cross-linked polyethylene. This material has revolutionized the plumbing world because it solves two of the biggest headaches associated with traditional materials: corrosion and rigid installation.
Unlike copper, which can pinhole over time due to aggressive water chemistry, PEX is naturally resistant to scale build-up and corrosion. When compared to PVC or CPVC, PEX offers a level of flexibility that allows you to “snake” lines through wall studs rather than cutting and gluing a dozen different joints. If you are currently working with older systems, you might be looking for more info about copper elbows to bridge the gap between your existing metal pipes and your new PEX runs.
The 3/4 inch size is typically used for the “trunk” or main distribution lines in a home. While 1/2 inch lines usually run to individual faucets or toilets, the 3/4 inch pipe carries the volume of water needed to ensure that when someone flushes a toilet, the person in the shower doesn’t get a face full of hot water. This is especially important in homes with multiple bathrooms or high-demand fixtures like rain showerheads and soaking tubs, where maintaining consistent water pressure throughout the system is essential.
Comparing PEX-A vs. PEX-B Systems
One of the most common questions we hear is about the difference between PEX-A and PEX-B. While both are excellent for potable water, they differ in how they are manufactured and how they connect.
| Feature | PEX-A (Expansion) | PEX-B (Crimp/Clamp) |
|---|---|---|
| Manufacturing | Peroxide method (Highest cross-linking) | Silane method |
| Flexibility | Highest; very easy to bend | Good; slightly stiffer |
| Connection | Expansion (Cold expansion) | Crimp rings or Stainless Clamps |
| Shape Memory | Yes; can be repaired with heat | No; kinks must be cut out |
| Cost | Generally higher | Generally lower |
PEX-A is often preferred by professionals because of its “shape memory.” If you accidentally kink a PEX-A pipe, you can often use a heat gun to return it to its original shape. It also uses expansion fittings, which don’t restrict water flow as much as the insert fittings used in PEX-B. If you’re building a high-flow system, you’ll want more info about PEX tees designed specifically for expansion systems.
PEX-B is a common and practical choice for many residential jobs. It is durable, budget-friendly for DIYers who already own a crimp tool, and widely used for dependable hot and cold water distribution.
Choosing the Right 3/4 PEX Products
Color coding is your best friend during a plumbing project. While the material inside is often identical, the outer tint helps you identify lines at a glance:
- Red PEX: Used for hot water lines.
- Blue PEX: Used for cold water lines. You can find more info about PEX blue pipe for your cold-water distribution needs.
- White PEX: The “universal” choice. White PEX is rated for both hot and cold water. Many homeowners buy white in bulk to simplify their shopping list.
Pricing for 3/4 PEX Coils
When shopping for 3/4 inch PEX supplies, you’ll notice that buying in bulk often drops the price per foot. A short repair length usually costs more per foot than a 100-foot coil, and stepping up to a 300-foot or 500-foot coil can improve value even more for whole-house repipes or large remodels.
Performance of 3/4 PEX Options
Customer feedback on 3/4 inch PEX products is generally strong, with users frequently praising the ease of use compared to soldering copper. Technical specs commonly show that these pipes can handle substantial pressure:
- 160 PSI at 73.4°F
- 100 PSI at 180°F
- 80 PSI at 200°F
This makes them suitable for everything from standard cold water lines to high-temperature hot water distribution.
Installation Essentials for 3/4 Inch PEX
Installing PEX is straightforward, but there are a few “pro tips” you should follow to ensure your system lasts for decades. First, always use a dedicated PEX cutter to ensure a square, burr-free cut. A jagged cut is the leading cause of leaks in crimp systems. It’s also a good idea to mark your pipe before cutting to ensure accurate lengths, reducing waste and saving money on larger projects.
If you are running pipe in an unconditioned space, like an attic in Idaho or Wyoming, while PEX is freeze-resistant (it can expand and contract), it is not freeze-proof. You should always use pipe insulation. For those high-pressure areas, you may also need more info about PEX pressure valves to keep your home’s PSI within a safe range.
Another critical factor is UV exposure. Most PEX pipes are only rated for limited UV resistance. Never store your PEX coils outside in the sun, and ensure they aren’t exposed to direct sunlight once installed. When routing PEX through areas where it might be exposed to light, consider using protective sleeves or conduit. For threaded connections to fixtures, don’t forget to grab more info about teflon tape to ensure a watertight seal.
Frequently Asked Questions about 3/4 PEX
What certifications should I look for in PEX pipe?
Always ensure your pipe meets ASTM F876 (for dimensions) and ASTM F877 (for system performance). For potable water, look for the NSF/ANSI 61 or cNSFus-pw marks. These certifications guarantee the pipe won’t leach harmful chemicals into your drinking water.
What is the return policy for PEX?
Return policies vary by seller, but many plumbing suppliers and retailers allow returns on unused, uncut coils with proof of purchase. Once you’ve cut a 100-foot coil into smaller pieces for your bathroom, it generally cannot be returned. Always double-check your measurements before making that first cut.
Are there bulk discounts for 3/4 PEX projects?
Yes. Beyond the standard 100-foot coils, you can often find 300-foot, 500-foot, and even 1,000-foot coils. Plumbing supply houses may also offer contractor packs or volume pricing for larger residential projects across the West, from Utah to California.
Conclusion
Whether you are a DIYer tackling a weekend repair or a pro planning a full installation, 3/4 inch PEX is the gold standard for modern plumbing. Its balance of durability, cost-effectiveness, and ease of installation makes it hard to beat.
At Standard Plumbing Supply, we take pride in supporting our communities across Arizona, California, Colorado, Idaho, Nebraska, Nevada, Oregon, Utah, and Wyoming. From Boise to Salt Lake City and down to San Diego, we are here to help you find the right tools and materials for every job. If you’re moving beyond PEX and into more advanced commercial or residential systems, you might want to check out more info about press elbows for high-efficiency connections.
Ready to start your next project? Use our store locator to find the Standard Plumbing Supply branch nearest you and get the expert advice you need to get the job done right.
