Williams 155 Jet Pump Assembly.
This special 155mm jet-pump assembly is sold without an impeller. The impeller is available as a separate component.
Used in 2014-2019 Williams tenders equipped with the Textron MPE-850 engine.
*Note* Only the Williams 445 comes with the 155mm Jetpump. All others come with the 07-0037 140mm Jetpump. https://weberpower.com/parts-williams-155-jet-pump-assembly.html