Vaillant Orings, Washers & Gaskets (Page 3)
The washers, o-rings and gaskets are used in various sections within your heating appliance. They are used to create seals between pipework and other parts within the boiler. Heat exchangers, condensate traps and many others parts require orings, washers and gaskets to prevent leaks of gas or water occuring.

Vaillant 981165 Packing O'Ring - Pack of 10 - Ecofit Pure System VU/Ecomax VUW
Part No: 1374921 MPN: 981165