The 3FJ-4MJ STR Expander from Fittings Unlimited Inc is a specialized fitting designed for expanding pipe connections in hydraulic systems. This straight expander features a 3mm female JIC and a 4mm male JIC connection, providing flexibility for various configurations. Made from high-quality materials, it ensures durability and resistance to wear and tear. Its compact design allows for easy installation in tight spaces, while its compliance with industry standards guarantees reliable performance. This fitting is ideal for both professional and DIY applications, ensuring a secure and leak-proof connection.