The Rheem RRT-12 Therm-X-Guard Expansion Tank is a 5-gallon tank designed to protect your plumbing system from pressure fluctuations. Constructed with high-quality materials, this expansion tank meets industry standards for safety and performance. Its compact design allows for easy installation in various systems, making it a versatile choice for residential and commercial applications. The tank effectively absorbs excess pressure, prolonging the life of your water heater and plumbing fixtures. Ideal for use with Rheem water heaters, this expansion tank is essential for maintaining system efficiency and safety.