Clutch slave cylinder hydraulic line. Enters on the drivers side through the bell housing. The bleed valve also exits through the bell housing some models on the driver side some on the passenger side.
89 2.5 TBI, 4" RC lift, 1" Booms, SYE, Adams Driveshafts front and rear, Ford 8.8 with 4:88s, BFG 33X12.50X15, and a ton of other stuff.
AF Jeep Club Tail Number 184