Thermostat Outlet Air Bleed Port Valve Stop

Thermostat outlet air bleeding fitting. This was first seen on 1994 on up C/K Trucks that started with the pressurized coolant recovery tank. This is applicable to earlier 6.2 and 6.5 applications most notable the 88-93 C/K trucks that have the boss but are unused and could benefit from this bleeder, or in situations where outlet is replaced and the new outlet has the threaded port and the old unit does not.