OTTO Excavator Parts Npr65 4Bd2 Cooling Water Bypass Pipe 8941324900 894132-4900 8-94132490-0 For Isuzu Durable 8-94132490-0 pipe fits OTTO Npr65 & Isuzu 4Bd2. Resists mining dust/heat, pressure-stable. Ensures steady engine cooling for non-stop heavy work.