The Stream33 2.1 Gallon Water Heater Expansion Tank is a versatile component designed for domestic hot water systems, ensuring system integrity by accommodating the expanded volume of water at high temperatures. It features a 3/4" NPT connection and is capable of withstanding pressures up to 150 PSI, with a maximum temperature limit of 200°F. This expansion tank can be installed in either a vertical or horizontal orientation, offering flexibility during installation. Ideal for residential or commercial properties, it serves as a critical safeguard against excessive pressure, thereby prolonging the life of water heaters and plumbing fixtures.