The unibody gate valve is commonly used to stop water from draining out of your spa so that heaters, pumps, control systems and more can be replaced with ease. If you spa does not currently have gate valves we recommend installing them especially when replacing your control system. The Valterra 2102X gate valve is for use with 1.5" plumbing and has a socket connection on one end and a spigot connection on the other end. This allows the installer to glue plumbing directly into the one side of the gate valve and slide the other end into a 1.5" coupling, fitting or union.