10-Pack PP 3-Way 4-Way Corner Connectors – Greenhouse Trellis 20mm

Build Stronger Garden Structures with Premium PP Corner Connectors

Whether you're constructing a greenhouse, grape trellis, sunscreen shed, or garden frame, these 10-pack PP plastic corner connectors are the versatile, heavy-duty solution you need. Engineered from high-strength polypropylene (PP), each fitting snaps securely onto 20mm diameter tubing and can serve as either a 3-way or 4-way connector depending on your project needs — giving you incredible flexibility in a single piece.

Made in Mainland China.

Why You'll Love These Connectors

• Dual Functionality: Each connector works as both a 3-way and 4-way fitting, adapting to your build design on the fly.
• High-Strength PP Material: Impact-resistant and weatherproof — these connectors won't crack, warp, or break under garden conditions.
• Universal 20mm Fit: Designed for 20mm diameter pipes or tubes, compatible with standard garden stakes, PVC, and PP tubing.
• Rated ≥850 kPa Pressure: Built to handle structural loads across frames and support systems.
• 10 Pieces Included: Enough to complete small to mid-size greenhouse or trellis builds straight out of the box.
• Black Finish: UV-stable black color resists fading and blends seamlessly into garden environments.

Product Specifications

• Material: Premium PP (Polypropylene) Plastic
• Color: Black
• Mouth Diameter: 20mm
• Size: 6.50 × 6.50 × 6.10 cm / 2.55 × 2.55 × 2.40 in
• Pressure Rating: ≥850 kPa
• Quantity: 10 Pieces per Pack
• Connector Types: 3-Way & 4-Way Corner Fittings

Perfect Applications

• Greenhouse frame construction
• Grape & vine trellis systems
• Sunscreen shade shed assembly
• Tomato cage & garden stake racks
• Plant support frameworks
• DIY garden frame structures

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For guidance on safe and effective greenhouse design practices, visit the U.S. Environmental Protection Agency (EPA) for resources on sustainable gardening structures.

Frequently Asked Questions

Q: What size tubing do these greenhouse corner connectors fit?

A: These PP plastic corner connectors are designed specifically for 20mm diameter tubes or pipes. They are compatible with standard garden stakes, PVC pipes, and polypropylene tubing of that size.

Q: Can I use these connectors as both 3-way and 4-way fittings?

A: Yes! Each connector in this 10-pack is designed to function as either a 3-way or a 4-way corner fitting, depending on how you configure your structure. This dual functionality makes them ideal for complex greenhouse and trellis builds.

Q: Are these connectors suitable for outdoor use?

A: Absolutely. Made from high-strength PP (polypropylene) plastic, these connectors are impact-resistant and weatherproof, making them well-suited for outdoor greenhouse frames, sunscreen sheds, grape trellises, and other garden structures.

Q: How many connectors come in the pack?

A: Each purchase includes 10 PP plastic corner connectors, providing enough fittings to complete small to medium-sized garden frame or trellis projects.