Plastic Bulkhead Fitting — Panel-Mount Hose Barb Connector for Tanks & Reservoirs
Routing a hose through a tank wall or reservoir panel without a reliable seal is a frustrating leak waiting to happen. Whether you are building a hydroponics system, setting up an aquarium sump, or plumbing a rainwater collection tank, this plastic bulkhead fitting gives you a clean, secure through-wall connection that DIYers, hobbyists, and small-scale system builders can install without special tools.
Each unit includes the threaded fitting body and a matching lock nut. The straight design features a hose barb on each end for flexible tubing attachment, with a threaded middle section that passes through a panel hole and locks tight with the included nut. Available in a wide range of sizes — barb diameters from 2.4mm (approx. 3/32") to 12mm (approx. 15/32"), with metric threads M5–M16 and imperial NPT threads 1/4" and 3/8". Select the variant that matches your tubing ID and panel thread standard.
Typical use cases include aquarium and sump tank plumbing where a hose barb bulkhead connector passes water lines through acrylic or glass panels; hydroponics and nutrient reservoir fittings where a threaded bulkhead fitting with nut creates a drip-tight wall port; and DIY rainwater or storage tank installations where a panel-mount hose fitting connects flexible tubing to a sealed container.
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Compatibility: Fits flexible tubing (silicone, PVC, polyurethane) matching the barb OD. Thread sizes: M5, M6, M8, M10, M12, M14, M16 (metric) and 1/4", 3/8" NPT (imperial). Confirm your panel hole thread and tubing inner diameter before ordering.
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Size format guide: Variant names follow the pattern [Barb OD mm] – [Thread] – [Barb OD mm]. Example: "4-M8-4" = 4mm barb on each end, M8 thread. Some variants show barb + thread only (e.g., "4-M6") for single-barb configurations. Confirm your panel hole size and tubing ID before selecting.
✅ Key Features of These Plastic Bulkhead Fittings
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🔩Through-Wall Mounting with Lock Nut — The threaded body passes through a drilled panel hole and is secured from the back with the included nut, creating a stable, vibration-resistant panel-mount hose fitting.
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💧Barbed Ends for Secure Hose Grip — The ridged barb profile bites into flexible tubing to resist pull-out and reduce the risk of leaks in low-pressure fluid systems including aquarium and hydroponics setups.
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⚙️Wide Thread Range — Metric and NPT — Available in M5 through M16 metric threads and 1/4" and 3/8" NPT imperial threads, making this hose barb bulkhead connector compatible with a broad range of tanks and panels.
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🪶Corrosion-Resistant Plastic Construction — Made from engineering-grade plastic (typically nylon or polypropylene), these fittings will not rust in wet environments, making them well-suited for aquarium, hydroponics, and outdoor reservoir use.
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🛠️Simple Hand Installation — The fitting can generally be tightened by hand or with minimal tooling, simplifying installation in tight spaces such as tank walls or equipment enclosures without requiring specialized plumbing tools.
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📐40+ Size Combinations in One Listing — Covering barb diameters from 2.4mm to 12mm and threads from M5 to M16, you can find the exact threaded bulkhead fitting with nut for your specific build without sourcing from multiple suppliers.
📐 Technical Specifications — Plastic Bulkhead Pipe Fittings
| Product Type |
Straight Hose Barb Bulkhead Fitting with Lock Nut |
| Material |
Engineering plastic (typically nylon or polypropylene) |
| Thread Types Available |
Metric: M5, M6, M8, M10, M12, M14, M16 / Imperial: 1/4" NPT, 3/8" NPT |
| Barb Diameter Range |
2.4mm (approx. 3/32") – 12mm (approx. 15/32"); see variant options |
| Configuration |
Straight, dual-barb (barb–thread–barb) or single-barb; see variant options |
| Included Hardware |
1x Fitting body + 1x Lock nut |
| Quantity per Order |
1 Pcs (see variant selector) |
| Pressure Rating |
Low-to-medium pressure; suitable for gravity-fed and low-pressure systems — contact us to confirm for specific applications |
| Compatible Tubing |
Flexible tubing: silicone, PVC, polyurethane (match tubing ID to barb OD) |
| Finish / Color |
See variant options |
| Country of Origin |
Contact us to confirm |
❓ Frequently Asked Questions
How do I choose the right bulkhead fitting size?
Match the hose barb diameter to your tubing inner diameter (ID). For example, a 4mm barb fits tubing with a 4mm ID. The thread size (M6, M8, 1/4" NPT, etc.) must match the threaded port or panel hole. The variant format is [barb OD]-[thread]-[barb OD], so "4-M8-4" means 4mm barbs on both ends with an M8 thread. If your panel hole is unthreaded, drill and tap it to match the fitting thread, or drill a clearance hole and rely on the lock nut to clamp.
What material is this bulkhead fitting made from?
These fittings are made from engineering-grade plastic, typically nylon or polypropylene. They are generally lightweight, corrosion-resistant, and suitable for water, mild chemicals, and low-pressure fluid systems. If you need compatibility with specific chemicals or solvents, contact us to confirm material suitability before ordering.
Can I use this fitting outdoors or in wet environments?
Plastic bulkhead fittings are generally resistant to moisture and corrosion, making them suitable for outdoor and wet environments in most cases. They are commonly used in rainwater tanks, garden irrigation systems, and outdoor reservoirs. Prolonged UV exposure may degrade some plastics over time — for long-term outdoor installations, consider shading the fitting or confirming UV resistance with us.
What is the maximum pressure rating for these fittings?
Plastic bulkhead fittings are typically rated for low-to-medium pressure applications. They are generally suitable for gravity-fed or low-pressure systems such as aquariums, hydroponics reservoirs, and rainwater tanks. For pressurized systems (e.g., mains water pressure), contact us to confirm suitability before installation.
Are these fittings compatible with standard metric and NPT threads?
Yes. This product is available in both metric thread sizes (M5, M6, M8, M10, M12, M14, M16) and imperial NPT sizes (1/4" and 3/8"). Select the variant that matches your panel port or tank thread standard. If you are unsure of your thread type, measure the thread pitch or use a thread gauge before ordering.
Does the lock nut come included with the fitting?
Yes. Each fitting includes a matching lock nut for secure panel or tank wall mounting. The nut threads onto the fitting from the opposite side of the panel to clamp it firmly in place. In most cases, hand-tightening plus a quarter turn with a wrench is sufficient to create a secure, leak-resistant mount.
What tubing types work with the hose barb ends?
The barbed ends are designed to grip flexible tubing such as silicone, PVC, polyurethane, and similar soft hose materials. The barb diameter should match or be slightly larger than the tubing inner diameter for a secure, leak-resistant connection. For added security in higher-flow applications, a hose clamp over the barb is generally recommended.
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