How to properly read a PEX plumbing manifold

Knowing how to properly read and identify a PEX manifold can help you find the right model faster.

Branches correspond to the number of outlets on the PEX manifold’s trunk, which are used to carry the supply of hot/cold water to plumbing fixtures. Typical number of branches is 2-12, depending on the model.

Branch sizes and types vary by model, with most common being ½” crimp style PEX connection and they can also come with or without ball valves.

Trunk identifies the body of the manifold. Trunk has an inlet and an outlet. Outlets on the manifold can sometimes be closed (capped) and such design is called “Spun Closed”. Most common manifold trunk sizes are ¾” and 1” copper pipe size.

Spun closed means that the other end (outlet) of the PEX manifold’s trunk is factory sealed, thus allowing water to flow only through the inlet and then be distributed through the branches.

Inlet and outlet connections indicate the type of connection a manifold has. Common connections are ¾” PEX, 1” copper pipe size and 1” copper fitting size.

Left and right types of manifolds are convenient when used in pairs for hot and cold water lines. By default, if there’s no indication of the type of the manifold, it is a Right-hand model, meaning that the inlet is on the left hand side and outlet is on the right hand. Left hand models have the inlet and outlet connections reversed.