The NEW Rinnai 3/4" FNPT Thread Isolation Valve Kit (MIVK-T-LW) is a high-quality product designed specifically for tankless hot water heaters. With its threaded style and smart home protocol, this isolator valve kit provides a secure and efficient way to control the water flow to your heating system. Made by the trusted brand Rinnai, this valve kit offers reliable performance and durability for your home improvement needs.