Webstone’s patented Isolator E-X-P E2 Service Valve Kits allow for quicker, consistent quality tankless water heater installations, with fewer leak paths. They are now available with Pro-Connect Press connections for even faster installation. Streamline future services and clean, flush or diagnose any tankless water heater with ease. Forged from lead-free CleanBrass certified to meet all low-lead laws and guaranteed for life.