· Certificate: FM/UL/3C/CE,etc.
· Standard: ANSI/UL 213C
· Housing Material: Ductile iron conforming to ASTM A-536, Grade 65-45-12.
· Bolt & Nut: Carbon steel
· Thread: Female thread, NPT / BSPT
· Rated pressure: 300~500PSI
· Surface: Hot dip galvanized/electrophoretic/epoxy powder painting
· Color: Variable colors for choice
The HDPE Coupling is a kind of mechanical coupling specially for HDPE pipe. It is the fastest and easiest way to connect HDPE pipe. In this way, you will save much time and cost on installation of HDPE pipe.
High-quality HDPE pipe couplings for water, gas, mining, and irrigation systems from Dikai, as grooved couplings manufacturer. Easy to install, corrosion-resistant, and compatible with various pipe sizes.
| PIPE O.D. | Dimensions | Bolt | ||||
| Min. mm | Max. mm | A mm | B mm | C mm | No. | Size mm |
| 50 | 50.5 | 70.7 | 111 | 105 | 4 | M10×50 |
| 63 | 63.6 | 86.7 | 128 | 105 | 4 | M10×50 |
| 75 | 75.7 | 97.5 | 140 | 105 | 4 | M10×50 |
| 90 | 90.9 | 113 | 156 | 105 | 4 | M12×75 |
| 110 | 111 | 136 | 180 | 112 | 4 | M12×75 |
| 140 | 141.3 | 167 | 210 | 118 | 4 | M12×75 |
| 160 | 161.5 | 187 | 230 | 118 | 4 | M12×80 |
| 200 | 201.8 | 228 | 290 | 127 | 4 | M16×100 |
| 250 | 252.3 | 279 | 345 | 134 | 4 | M16×100 |
| 280 | 281.7 | 312 | 391 | 134 | 4 | M20×115 |
| 315 | 317.9 | 347 | 428 | 134 | 4 | M20×115 |
HDPE Pipe Couplings are mechanical fittings designed to securely connect high-density polyethylene (HDPE) pipes in various fluid handling systems. Unlike traditional welding or fusion methods, HDPE couplings offer quick, flame-free installation, are reusable, and provide leak-tight performance under pressure.
These couplings are ideal for above-ground and underground plastic piping systems requiring flexibility, corrosion resistance, and cost-effective maintenance.
| Coupling Type | Application |
|---|---|
| Mechanical Coupling | Ideal for field repair and retrofit without fusion |
| Compression Coupling | Common in small-diameter water pipelines |
| Electrofusion Coupling | Suitable for long-term, high-pressure applications |
| Grooved HDPE Coupling | Fast-install for grooved HDPE pipe ends |
| Flanged Adapter Coupling | For connections to metal or valve interfaces |
| Reducing HDPE Coupling | For joining different pipe sizes (e.g., 110mm × 90mm) |
Material: PE100 or reinforced engineering plastic
Sizes Available: 20mm to 630mm (customizable)
Sealing: Integrated rubber gasket (EPDM / NBR)
Pressure Rating: PN10, PN16, PN20 available
Connection Type: Push-fit, bolt-tightened, or fusion-ready
Corrosion Resistant: Ideal for chemical, saltwater, and sewer lines
UV Resistant Coating: Optional for outdoor installations
Color Options: Black, blue, green, or as per project specs
HDPE couplings are widely used in industries where flexibility and durability are critical:
Municipal Water Supply
Underground Sewage and Drainage Systems
Agricultural Irrigation Networks
Mining Slurry and Chemical Conveyance
Gas Distribution Systems
Construction Site Temporary Water Lines
Rainwater Collection Systems
| Feature | HDPE Coupling | Butt / Electro Fusion |
|---|---|---|
| Installation | Fast, no welding required | Requires special equipment |
| Repair & Replacement | Easy to disassemble | Difficult and costly |
| Flexibility | Allows slight movement | Rigid |
| Cost | Lower labor cost | Higher setup cost |
| Portability | Lightweight and modular | Equipment-intensive |
All HDPE couplings from our factory comply with global standards:
ISO 4427 / EN 12201 / ASTM D3035
WRAS certified materials for potable water
CE certified for export to Europe
Tested under PN10–PN20 pressure ratings
UV & chemical resistance tested
OEM/ODM compatible with client drawing approval
Need a custom-sized HDPE pipe coupling or a specialized adapter for metal-to-HDPE transition? We support:
Custom sizing (e.g., 355mm to 315mm reducer)
Flange connections to valves or metal pipes
Threaded insert adapters
Dual-layer UV protective coating
Logo embossing and private label packaging
| mm Sizes | Inch Equivalent |
|---|---|
| 20mm, 25mm, 32mm | ¾", 1", 1¼" |
| 40mm, 50mm, 63mm | 1½", 2", 2½" |
| 75mm, 90mm, 110mm | 3", 3½", 4" |
| 160mm, 200mm | 6", 8" |
| 250mm, 315mm | 10", 12" |
| 400mm, 500mm, 630mm | 16", 20", 24" |
Q: Can HDPE couplings be reused?
A: Yes. Most mechanical and compression HDPE couplings are designed for reusability and easy installation/removal.
Q: Are your couplings suitable for drinking water systems?
A: Yes. All materials are food-grade and WRAS/ISO certified for potable water use.
Q: Do you offer electrofusion couplings with barcode stickers?
A: Yes. Our electrofusion fittings include barcode labels for automatic welding machines.
Q: Can I get couplings with flange ends for valve connections?
A: Absolutely. We provide HDPE flange adapter couplings for metal or valve transitions.
Q: What is your MOQ for HDPE pipe fittings?
A: Generally 500 pcs, but we support trial orders for project bidding or sampling.
CNG (Hebei DIKAI Piping Products Co., Ltd.) has been manufacturing high-quality pipe coupling systems since 2002. With:
50,000+ tons annual output
110,000+ m² production base
Over 500 employees
Export to 80+ countries
Strong OEM/ODM capability
ISO, CE, WRAS certifications
We’re your one-stop partner for plastic and metal piping connection solutions.
Looking for durable HDPE pipe couplings with easy installation and leak-free performance?
Contact us today for a free quote, technical drawings, and samples.
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