La Pavoni Boiler to Grouphead Water Pipe code 326002 OEM part no. 326002 makes the water connection between the boiler and group head of your LP.
It needs the right pressure in order to make the travel towards the GH.
La Pavoni Boiler to Grouphead Water Pipe code 326002 has the position no. 84 on the second photo of the product, which is the LP scheme.
Used as standard on most LP machines.