The 12FJ-4MFO Straight Reducer & Expander by Fittings Unlimited Inc is designed for efficient size transitions in fluid systems. Featuring a 12FJ inlet and a 4MFO outlet, this fitting is perfect for connecting different pipe sizes in hydraulic and plumbing applications. Constructed from durable materials, it offers excellent resistance to pressure and corrosion. Its straight design allows for easy installation and optimal flow characteristics, making it suitable for both residential and industrial use. This reducer/expander meets industry standards for quality and performance.