The 8FJ-12MJ STR Expander from Fittings Unlimited Inc is engineered to provide seamless transitions between pipe sizes. With an 8mm outer diameter and a 12mm inner diameter, this expander is made from durable materials that ensure long-lasting performance in various applications. It is perfect for fluid transfer systems that require size adjustments and meets industry compliance standards. The expander's design allows for easy installation and secure connections, making it a reliable choice for both commercial and residential use.