Lose of clutch pressure.

that's the hydraulic line for the clutch probably have to replace it , hopefully the O-ring on the new line will match the old slave cylinder and not leak , it will have to be bled to don't open the bleeder too much and before you drive it sit in the cab and press the clutch 100 times to make darn sure it don't leak if it starts leaking on the road you'll have to slam gears to shift and possibly ruin the tranny