The product is a 3/4" brass temperature pressure relief valve designed for use with portable immersion water heaters or boilers. It is self-closing and has a maximum pressure of 150 psi and a temperature setting of 210 degrees. This relief valve is essential for maintaining the safety and functionality of your water heating system by releasing excess pressure and preventing overheating. Made of durable brass, this valve is compatible with various types of heating systems and is a reliable component for ensuring efficient heating in your home.