Seaward Thermostatic Mixer ValvePlumbing “safety fitting” for the Whale “Quick Connect” system. Thermostatic mixer valve using three 1/2″ BSP Male threaded ports.Constructed of nickel-plated brass including non-return valve. Each BSP running thread is fittted with O-ring.WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov. Brochure (pdf)