OTTO Excavator Parts Tfr55 4Jb1 Cooling Water Bypass Pipe 8943822470 894382-2470 8-94382247-0 For Isuzu Durable 8-94382247-0 pipe fits OTTO Tfr55 & Isuzu 4Jb1. Resists mining dust/heat, pressure-stable. Ensures steady engine cooling for non-stop heavy work.