TB Aquatics has a special selection of the most durable and efficient aquarium bulkheads in the market. Bulkheads are used to attach plumbing or connect water filtration systems to your aquarium or sump. They are also used everytime you create a hole through glass or acrylic to simplify and secure the connection. Each ABS bulkhead is made from black ABS plastic and designed to be slighty thicker than usual bulkheads to ensure secure fitting, avoid stress cracks and leakage. Bulkheads also make it possible to remove pumps and accessories without much effort. Rest assured that you'll have secure connections when your using our ultra reliable ABS bulkheads!