Hydro-Core is the ideal solution for near boiler piping or secondary loops. By combining the Webstone Isolator and Ball Drain with closely spaced tees, the Hydro-Core Manifold system eliminates costly field fabrication, avoids precise calculations and simplifies future service. For combi boilers, this kit also contains the isolation valves to connect and service the integral domestic hot water unit. Designed for use with in residential or commercial systems. Refer to specification sheets for additional technical information. All Webstone products are backed by a limited lifetime warranty.