Bulkhead fittings are designed to create a watertight or airtight seal through the wall of a tank, barrel, or other container. They’re commonly used in applications like rain barrels, aquariums, water tanks, pools, and even air or hydraulic systems. By allowing pipes or hoses to pass through a solid wall without leaking, bulkhead fittings make it easier to connect plumbing or tubing for draining, filling, or circulating fluids. Their versatility means you’ll find them in both residential and commercial setups, wherever a secure connection through a container wall is needed.

Yes, there are a few alternatives to bulkhead fittings, depending on your project. Some options include:

• Uniseal fittings – Flexible rubber grommets that seal around pipes, often used for tanks with curved surfaces.
• Threaded tank adapters – These can provide a similar function but may not offer the same level of leak resistance as bulkhead fittings.
• Compression fittings – Useful for connecting pipes but typically not designed for passing through tank walls.

Each alternative has its own pros and cons, so consider your container material, pressure needs, and ease of installation before choosing.

Bulkhead fittings are sometimes called tank adapters or tank connectors. In plumbing and industrial supply catalogs, you might also see them listed as through-wall fittings or tank wall fittings. While the names can vary, they all refer to fittings designed to create a sealed connection through the wall of a container or tank. Checking product descriptions can help you find the right part for your project.

The hole size for a bulkhead fitting depends on the fitting’s specific size and design. Most manufacturers provide a recommended hole diameter in the product instructions. As a general tip:

• Measure the outside diameter of the fitting’s threaded section.
• Use a hole saw or drill bit that matches the recommended size—usually slightly larger than the fitting’s threads to allow for the gasket and easy installation.

Double-check the product details to ensure a snug, leak-resistant fit.

To install a bulkhead fitting:

1. Mark and drill the correct size hole in the tank wall.
2. Clean the area around the hole to remove debris.
3. Insert the fitting through the hole, placing the gasket on the inside or outside as directed by the manufacturer.
4. Tighten the nut by hand, then use a wrench for a snug fit—avoid over-tightening to prevent damage.

Always follow the specific instructions included with your fitting for best results and to help prevent leaks.