This 10 Piece Package of High Purity Fittings is equivalent to the Swagelok SS-400-4 model. The fitting shape is a cross, with compression-to-compression end A-to-end B diameter of 1/4 inches. These compression fittings are made of stainless steel and are perfect for use in various applications such as hydraulics, pneumatics, pumps & plumbing. The item falls under the categories of Compression Fittings, Pipe & Hose Fittings, Fittings & Adapters, Hydraulics, Pneumatics, Pumps & Plumbing, Business & Industrial. The end C diameter for tees is also 1/4 inches. These fittings are easy to install and highly durable, making them a great choice for any application that requires reliable connections.