Double Barb Bulkhead Fitting Through-Wall Connector for Tubing

The Qimao Metal Manufacturer Double Barb Bulkhead Fitting Through-Wall Connector for Tubing solves a simple but annoying problem: how to pass a hose through a wall without leaks or kinks. One piece does everything. The threaded body goes through a drilled hole, the rubber washer and nut tighten from the outside, and both barbed ends accept flexible tubing. No additional adapters or sealants required for most low-pressure applications.

Unlike single barb fittings that leave the inside of your tank unfinished, this design gives you a clean connection on both sides. The barbs have slightly tapered ridges that bite into the hose inner wall without cutting it. Once the tubing is pushed on fully, it takes real effort to pull it off. That's the point.

The material choice matters. Our brass versions handle fuel, oil, and higher temperatures. Polypropylene resists corrosion and works fine for water, air, or mild chemicals. Neither one rusts like steel would.

Product Parameter (Specification)

Product Feature

• Two barbed ends, one fitting – Double Barb Bulkhead Fitting Through-Wall Connector for Tubing Connects tubing on both sides of a wall without needing separate adapters or bulkhead unions

• No thread sealing tape required – The barb grip provides the seal, not pipe threads. Just push tubing on and you're done.

• Positive retention barbs – Tapered ridges bite into the tubing inner wall. Once seated, the hose won't vibrate loose or pull off under normal use.

• Captive locknut with washer – Seals against the panel surface evenly. The rubber washer compensates for slightly uneven holes or minor surface scratches.

• Compact through-wall design – Fits flush, so the fitting doesn't stick out far on either side. Good for tight enclosures or control cabinets.

• Multiple material options – Brass for fuel, oil, and heat. Polypropylene for water, saltwater, and corrosive chemicals. Nylon for pneumatic systems.

• Tool-free tubing installation – No clamps, no ferrules, no compression rings. Just push. Removal requires cutting the tube or pulling hard with pliers.

Application

• Aquarium and hydroponic systems – Runs air lines or water recirculation tubing through tank walls without drilling threads or installing bulkhead unions

• Fuel tank send and return lines –Double Barb Bulkhead Fitting Through-Wall Connector for Tubing pass diesel, gasoline, or biodiesel through tank walls on boats, RVs, and generators

• Water storage and rainwater collection – Connects overflow tubes or outlet hoses on plastic cisterns and IBC totes

• Pneumatic control cabinets – Runs 1/4″ air tubing through enclosure walls to solenoid valves or pressure switches

• Chemical dosing equipment – Polypropylene or PVDF versions handle bleach, acids, or caustics without degrading

• Coolant lines for CNC machines – Passes coolant hose through tank walls or machine enclosures with a leak-proof seal

Production Details

We've run the cold heading for bulkhead fittings long enough to know where cheap ones fail. For Double Barb Bulkhead Fitting Through-Wall Connector for Tubing every double barb fitting we ship starts with virgin resin for plastic versions or continuous-cast brass bar stock for metal ones. The barb geometry gets cut with sharp tooling so the ridges actually grip, not just slide. We test random samples from each batch by pushing tubing on and pulling it off with a force gauge. If it doesn't meet our minimum pull-off spec, the whole lot gets reworked.