Three Valve Quick Connect Air ManifoldThis 3 valved outlet air assembly is used when operating two or three pond diffusers from a single rocking piston compressor. This helps control air flow to diffusers, dissipate heat from compressor before the air tubing and also includes a pressure relief valve to protect the compressor if airlines become kinked, plugged or frozen. Aluminum and brass design Designed for use 1 4 outlet rocking piston compressors Includes swivel union for easy removal