Caterpillar part numbers starting 4W3
| 4W3027 | Breather assembly (valve cover & breather) | Caterpillar | ||
| 4W3034 | Clamp (valve cover & breather) | Caterpillar | ||
| 4W3100 | Gasket (water lines, bypass) | Caterpillar | ||
| 4W3108 | Valve assembly (thermostats) | Caterpillar | ||
| 4W3127 | Housing (outlet) (water lines, bypass) | Caterpillar | ||
| 4W3169 | Plunger (shutoff, electric) | Caterpillar |