11 MODULAR MANIFOLD KITS FOR INSTALLING BOILERS FOR HEATING SYSTEMS, CONSISTING ESSENTIALLY OF COPPER PIPES OF VARIOUS SIZES WITH ELBOWS, CAPS, TEES, UNIONS, ADAPTORS, BALL VALVES, PURGE VALVES, BACKFLOW VALVES, A PRESSURE REGULATOR, CIRCULATOR ISOLATION FLANGES AND A POWER VENT CONNECTION FOR FLUE GASES