The factory washer reservoir on the Volkswagen MK7 Golf R and Audi 8V S3 is made up of two parts, an upper and a lower reservoir. The lower reservoir houses the majority of the washer fluid capacity while the upper reservoir acts as a filler neck. In order to install the Spulen Catch Can Kit the upper reservoir needs to to be removed. The Spulen Washer Fluid Reservoir Relocation Kit replaces the upper reservoir and provides a stylish and functional filler neck for your washer fluid system while allowing additional clearance for a catch can system. The washer fluid system capacity is reduced to 2.4 liters from the factory 3.7 liters.