OTTO Excavator Parts Sh4503B 6Uz1 Cooling Water Bypass Pipe 8976084730 897608-4730 8-97608473-0 For Isuzu Durable 8-97608473-0 pipe fits OTTO Sh4503B & Isuzu 6Uz1. Resists mining dust/heat, pressure-stable. Ensures steady engine cooling for non-stop heavy work.