OTTO Excavator Parts Nkro2 4Jb1T Cooling Water Bypass Pipe 8972134000 897213-4000 8-97213400-0 For Isuzu Durable 8-97213400-0 pipe fits OTTO Nkro2 & Isuzu 4Jb1T. Resists mining dust/heat, pressure-stable. Ensures steady engine cooling for non-stop heavy work.