Caleffi’s 520 Series TANKMIXER quick-connect kit is a mixing valve solution to maximize capacity of modern, high-efficiency water heaters and minimize installation time. Everything needed for fast installation is available in the kit, including a cold water cross with check valve, flexible pipe and press, sweat or NPT fittings. With a minimum flow rating of 0.5 gpm, it delivers stable temperatures. Connecting a recirculation circuit is easy with the integral inlet port on the cold water cross, and a tight hot water close-off prevents recirculation line temperature creep to protect pump’s aquastat service life. Its anti-scale polymer materials ensure stable temperature control and long life.