Sir Tools VZ31 Volkswagen Cooling System Expansion Tank Adapter

The Sir Tools VZ31 is a cooling system expansion tank adapter designed for use with Volkswagen vehicles. This adapter threads securely onto the expansion tank filler neck, allowing technicians to connect a cooling system pressure tester or vacuum fill tool to properly pressurize, test, and service the liquid cooling system.

Expansion tank adapters like the VZ31 are an essential part of any professional cooling system test kit, enabling leak detection and pressure testing without damaging the expansion tank or its threads. The VZ31 is specifically engineered to match the threaded filler neck profile found on Volkswagen models from the 1990–1997 model year range.

Key Features:

• Designed for Volkswagen expansion tanks with threaded filler necks
• Enables secure, leak-free connection to cooling system pressure testers
• Compatible with standard cooling system pressure test and vacuum refill tools
• Durable construction for reliable use in professional shop environments
• Part of the Sir Tools / Ingersoll Rand cooling system adapter series

Note: This part is no longer available (NLA) from the manufacturer. SKU: SIRVZ31.