How to install a Schedule 80 PVC union fitting
If you're working on a high-pressure plumbing system—whether it’s for irrigation, industrial flow control, or aquaponics—you need a secure, reliable way to connect and disconnect pipes without cutting or compromising the system. That’s exactly where a Schedule 80 PVC union fitting shines.
In this guide, we’ll walk you through what a Schedule 80 union is, why it’s important, and how to properly install one. Plus, we’ll highlight 247Garden’s premium SCH80 union fittings, available from 1/2 inch up to 2 inches.
What Is a Schedule 80 PVC Union?
A PVC union is a type of fitting that allows two pipes to be easily disconnected and reconnected—unlike permanent couplings or cemented joints. A Schedule 80 (SCH80) PVC union is made with thicker walls and designed to withstand higher pressure ratings than its Schedule 40 counterpart.
It typically includes three parts:
Why Use a Schedule 80 PVC Union?
1. High Pressure Applications
SCH80 PVC unions are designed for pressurized systems, including:
- Commercial plumbing
- Aquaponics systems
- Industrial filtration
- Pool and spa plumbing
- Chemical process lines
2. Easy Disassembly
Unions allow for non-destructive maintenance. You can disassemble a section for cleaning, replacing pumps, or winterizing without cutting pipes.
3. Chemical Resistance
Made from rigid, high-quality PVC, SCH80 unions are resistant to corrosion and many chemicals, making them ideal for systems with exposure to fertilizers, chlorine, acids, or other reactive substances.
What to Look for in a SCH80 Union Fitting
When selecting a union, consider the following:
| Feature | What to Check |
|---|---|
| Size | Match your pipe system (1/2", 3/4", 1", 1-1/2", or 2") |
| Connection Type | Socket x Socket or Threaded x Threaded (FPT) |
| Seal | Most common is EPDM O-rings |
| Material | Gray Schedule 80 PVC (ASTM D2467-compliant) |
| Certifications | NSF-rated if used for potable water |
| Service Pressure | Should align with your system (typically 150–300 PSI depending on size) |
How to Install a Schedule 80 PVC Union
Step-by-Step Guide Using 247Garden SCH80 PVC Unions
Tools & Materials Needed
- 247Garden SCH80 PVC union fitting or any compatiable fittings
- SCH80 PVC pipes
- Primer and PVC cement (for socket unions)
- Teflon/PTFE tape (for threaded unions)
- Pipe cutter or saw
- Marker and measuring tape
- Clean rag
Step 1: Choose the Correct Union
For general plumbing, irrigation, or aquaponics, 247Garden recommends using socket-type SCH80 unions for permanent installations and threaded unions if you expect to disassemble the system frequently.
Step 2: Measure and Cut Pipe
- Mark the cut line with a marker.
- Use a pipe cutter or fine-tooth saw to make a clean, straight cut.
- Remove burrs and smooth the edge with sandpaper or a deburring tool.
Step 3: Dry Fit Components
- Test fit the SCH80 union to ensure everything lines up before cementing or sealing.
- Identify which side you’ll want to disconnect in the future and orient the union accordingly.
Step 4: Apply Primer and Cement (For Socket Unions)
- For socket unions:
- Apply purple primer to both the pipe and the inside of the union’s socket end.
- Then apply PVC cement to both primed areas.
- Immediately push the pipe into the socket with a slight twist and hold for 10 seconds.
- For threaded unions:
- Apply Teflon/PTFE tape clockwise around the male threads.
- Hand-tighten the threaded end into the female union and give an extra 1/4 turn with a wrench if needed (don’t over-tighten).
Step 5: Hand-Tighten the Union Nut
- After both sides of the union are in place, bring them together and tighten the union nut by hand.
- The built-in O-ring will compress and form a watertight seal.
- Do not use a wrench or tool on the nut, as overtightening may damage the threads or O-ring.
Step 6: Allow Time to Cure
- Let the joint cure for at least 15–30 minutes before handling.
- Wait 24 hours for full pressure testing if cement was used.
Step 7: Test the System
- Slowly pressurize the system and check for leaks.
- If leaks occur at the union, check O-ring alignment and ensure the union nut is properly seated.
Why Choose 247Garden for SCH80 PVC Unions?
At 247Garden, we make it easy for professionals, growers, and DIYers to get industrial-grade Schedule 80 PVC union fittings without the high costs or minimum order restrictions found at big-box retailers.
Key Advantages:
- Sizes from 1/2” to 2” readily available
- ASTM D2467 compliance
- Socket and threaded options
- Bulk discounts available
- Perfect for greenhouses, irrigation, aquaponics, pool systems, and more
Final Thoughts
Installing a Schedule 80 PVC union fitting is a smart move for any system where strength, reliability, and future maintenance access matter. With proper installation, these fittings can last for decades while providing easy access points when you need to repair or expand.
For the best in Schedule 80 PVC fittings, trust 247Garden—your affordable source for high-quality pipe fittings and fast nationwide delivery.
