This Orbit 1-inch transition adapter has an MPT (Male Pipe Thread) connection for attaching lawn sprinkler valves to Orbit s PVC slip or threaded valve manifold adapters. This adapter can be used to connect to, expand or repair sprinkler valve manifolds quickly and efficiently. With 1 -inch buttress thread as well as the 1-inch male threading, this transition adapter is versatile for many different Orbit valve manifold systems. You do not need any special tools or a guide for how to build a sprinkler manifold system because this Orbit transition adapter hand-tightens to a sprinkler manifold quickly. Valve manifold assembly does not get much easier than this. Features and Benefits: Has 1-inch male threading by 1 -inch buttress threading, Needs no special tools for attachment, Repairs, connects or expands preassembled valve manifolds, Connects a 1-inch valve to a - or 1-inch PVC slip or threaded adapter.