Cummins — 5, Water outlet 42. Provision for coolant heater.

A Cummins service procedure — check it applies to your exact model before use.

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Procedure

1. 6. Lubricating oil filter
2. 7. Water inlet

Source: manual:Cummins Diesel B Series Manual 2003 (2).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.