4mm Hydroponic Adaptors & Joiners | Drip Irrigation Tubing Connectors (Pack of 100)

When you're building or expanding a drip irrigation system, the fittings that connect your tubing are just as important as the tubing itself. A loose connection or incompatible adaptor means nutrient solution on your floor instead of in your root zone. These 4mm hydroponic adaptors and joiners are designed to eliminate that problem, providing secure, leak-resistant connections between feeder lines, manifolds, and system components in any hydroponic or drip irrigation setup.

Available in three configurations to suit different connection requirements, each option is sold in packs of 100, making them ideal for growers building multi-plant systems, replacing worn fittings across an existing setup, or stocking up for ongoing maintenance. At 4mm, these fittings are compatible with the standard feeder line size used in most hydroponic drip systems, including those running water rings, drippers, and inline emitters.

Variant Guide

• 4mm Adaptor & Joiner (Pack of 100). Connects two sections of 4mm tubing end to end. Used for line extension, repair, and system modification. Maintains continuous, uninterrupted flow through the irrigation line.
• 4mm Adaptor Quick Thread (Pack of 100). Connects 4mm tubing to threaded outlets on manifolds, irrigation hubs, and system ports. Quick-fit design allows easy installation and removal without tools, making it ideal for systems that require regular reconfiguration.
• 4mm Barbed Joiner (Pack of 100). Push-fit barbed connector for 4mm tubing. The barbed design grips the inner wall of the tubing to create a tight, leak-resistant seal suited to stable, long-term connections in permanent irrigation layouts.

Key Benefits

• Three connection types in one range. Straight joiners, quick-thread adaptors, and barbed joiners cover every 4mm connection scenario in a single product family.
• Sold in packs of 100 for full system builds. Enough fittings to set up, expand, or fully re-plumb a multi-plant drip irrigation system without running short mid-build.
• Leak-resistant connection design. Each fitting type is engineered to maintain a secure seal under normal hydroponic system operating pressure.
• Compatible with standard 4mm irrigation tubing. Fits the feeder line size used across most hydroponic drip systems, water rings, and inline emitters.
• Durable UV-stabilised polymer construction. Withstands the humidity, nutrient exposure, and temperature variation of indoor grow rooms and greenhouse environments.
• Easy push-fit and threaded installation. No specialist tools required. Fittings install by hand for fast system builds and quick repairs.

Applications

• Hydroponic drip irrigation system builds and expansion
• Nutrient delivery feeder line connection and repair
• Connection to pumps, manifolds, and irrigation hubs
• Indoor grow room and grow tent irrigation setups
• Greenhouse fertigation system plumbing
• Commercial multi-site drip irrigation layouts

Technical Specifications

• Size. 4mm
• Pack Size. 100 units per pack
• Connection Types. Barbed joiner / straight adaptor & joiner / quick-thread adaptor
• Material. UV-stabilised polymer
• Application. Hydroponics, drip irrigation, fertigation
• Function. Tubing connection, extension, system integration
• Environment. Indoor, greenhouse, commercial systems
• Pack Weight. Approx. 0.15 to 0.25 kg

Frequently Bought Together

These 4mm adaptors and joiners are designed to work alongside the rest of your irrigation system. Run your feeder lines using Hydroponic Soft Tube in 4mm through 25mm for kink-free, flexible irrigation lines that pair directly with these fittings. Use Hydroponic Cross Pipe Fittings to split your irrigation line into four directions simultaneously, ideal for multi-plant layouts and manifold-style drip systems. Add Quick Action Valves to individual feed lines for per-plant flow control, and power the whole system with the Rio HF Submersible Water Pump.