This BackStop thermal expansion tank is a must-have for your water heater safety. With a capacity of 2.1 gallons and a 3/4" MIP connection, it is compatible with most water heaters. The tank is designed to absorb excess water pressure, preventing damage to your water heater, pipes and fixtures. Made by trusted brand BackStop, this thermal expansion tank is reliable and durable. It is easy to install and maintain, making it a great investment for your home's plumbing system. Get peace of mind knowing that your water heater is protected with this essential safety tank.