PEX-M12-4 is a stainless steel 4 Loop Radiant Manifold kit from VIVO. Features include body flow meters with adjustable flow rates, isolation ball valve with 1" NPT thread made of high-quality brass forging, stem thermometers for both isolation ball valves, automatic air purge valves, ½" compression connectors, and mounting brackets. Each port is spaced 2" apart and has its own turn off valve. The entire manifold measures approximately 10" x 15" and has an approximate weight of 12lbs. PEX-M12-4 is commonly used for radiant floor heat systems and features easy installation. Complete kit as shown in the pictures provided (1 supply manifold, 1 return manifold, 4 flow meters, 8 adapters (1/2"), 2 isolation ball valves with 1" NPT and temperature gauges, 2 air vents, 2 drain valves, 1 heavy duty mounting bracket. Not suitable for potable water applications.