Steel Adapter, M14 x 1.5 Male Komatsu To M14 x 1.5 Male Komatsu, Straight

This Adaptall fitting is made specifically to work with Komatsu and Kobelco machinery using M14 x 1.5 threading, so it should be a direct replacement for your leaky fitting.

That's what this one's built for. Both ends are M14 x 1.5 Male Komatsu thread, so you're connecting the same thread type on each side. It's a straight union, no angle to it, which keeps the hydraulic connections clean and the install pretty simple. Adaptall makes solid fittings and this one's steel construction holds up well in the kind of heavy-duty hydraulic work these machines see day in and day out.