MMM DOT ADAPTER 3/8X1/4

That's what it's built for. The 540604S bridges a 3/8 inch line down to a 1/4 inch port, giving you a secure connection without having to rework your whole hydraulic connections setup. Midland Industries makes solid fittings, and this one is precision-sized so you're not fighting leaks at the joint. Good fit for industrial hydraulic lines where that size reduction comes up.