Union Nut Windshield Washer Reservoir

Fastening nut for the windshield washer hose.
Hose nut for the washer fluid tank:
VW Beetle - from 8/67.
Karmann Ghia - from 8/67.
T2 Bus - 8/67 to 7/79.
Type 3 - all model years.
Type 181 (Thing) - all model years.

This plastic nut is used to connect the supply hose to the tank and, on some models and years, also to connect the metal brake hose to the brake fluid reservoir.

Over-tightening or ageing of the plastic can cause the nut to crack. A cracked nut is therefore the most common reason a replacement is needed.