The 6 X 3" 125# CI RED COMPANION from Service Metal Products is a cast iron fitting designed for low-pressure applications. With a 125# pressure rating, this companion flange is perfect for connecting pipes in various plumbing and HVAC systems. Its durable cast iron construction ensures resistance to corrosion and wear, making it suitable for both indoor and outdoor use. The dimensions allow for easy integration into existing systems, providing a reliable solution for piping connections in residential and commercial settings.