Rainwater Tank Bulkhead Fittings
Bulkhead Fittings for Rain Barrels and Rainwater Collection Tanks
Rainwater collection systems often require a reliable way to connect plumbing to storage containers such as rain barrels, cisterns, or large water tanks. Bulkhead fittings provide a secure, leak-proof connection point that allows water to flow safely from the tank into irrigation systems, filtration equipment, or additional storage containers.
Whether you are building a simple backyard rain barrel system or plumbing a larger rainwater storage tank, the right bulkhead fitting makes installation easier and prevents leaks over time.
What Is a Rainwater Tank or Rain Barrel?
A rainwater tank (often called a rain barrel) is a container used to collect and store rainwater from rooftops, gutters, or other collection systems. These tanks allow homeowners, gardeners, and off-grid systems to reuse rainwater for irrigation, landscaping, hydroponics, or general outdoor use.
Common rainwater containers include:
• Plastic rain barrels
• Large polyethylene water tanks
• IBC tote containers
• DIY storage tanks or barrels
Because these containers do not usually come with built-in plumbing connections, a bulkhead fitting is commonly installed to create a sealed outlet for water flow.
Why Use a Bulkhead Fitting in a Rainwater Tank?
A bulkhead fitting allows pipes, valves, or hoses to pass through the wall of a tank while maintaining a watertight seal.
Benefits include:
• Leak-proof connection through the tank wall
• Easy connection to PVC plumbing systems
• Durable and long-lasting seal
• Simple installation with standard tools
Once installed, the bulkhead can connect to valves, hose adapters, irrigation systems, or additional storage tanks.
Recommended Bulkhead Sizes for Rainwater Tanks
The correct bulkhead size depends on how much water you want to move through the system.
1" Bulkhead Fittings
Often used for small rain barrels or irrigation systems where moderate flow is sufficient.
1.5" Bulkhead Fittings
A common choice for medium-size rainwater tanks and garden irrigation systems.
2" Bulkhead Fittings
Best for larger rainwater tanks, high-flow drainage, or systems that connect multiple tanks together.
Installing a Bulkhead in a Rain Barrel or Water Tank
Installing a bulkhead fitting in a rainwater tank is straightforward and can usually be completed with basic tools.
Typical installation steps include:
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Drill the correct hole size in the tank wall.
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Insert the bulkhead fitting through the hole.
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Ensure the gasket sits flush against the tank surface.
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Tighten the retaining nut securely from the opposite side.
Once installed, the bulkhead fitting can connect to PVC pipe, valves, or irrigation systems.
Bulkhead Installation Guide
Correct installation is critical to prevent leaks.
See the step-by-step guide below
Click to view the full installation instructions
Choosing the Right Bulkhead Fitting
When selecting a bulkhead fitting for a rainwater tank, look for:
• Durable materials designed for water systems
• Reliable gaskets that maintain a watertight seal
• Compatibility with standard PVC plumbing components
High-quality bulkhead fittings are designed to provide long-term leak protection, even when tanks expand or contract due to temperature changes.
Shop Bulkhead Fittings for Rainwater Tanks
Browse our selection of bulkhead fittings designed for water tanks, rain barrels, aquariums, hydroponic systems, and other reservoir applications.
Recommended sizes for rainwater tank plumbing:
1" Bulkhead Fittings
1.5" Bulkhead Fittings
2" Bulkhead Fittings
These fittings are commonly used in rainwater collection systems, irrigation setups, hydroponics, and water storage tanks.