FIT623 T-Tech FastFit 5/16” Male Universal Quick Connect Fitting. New FastFit fittings allow instant connection to the T-TECH Service Hose Adapters for quick service set-up. All fittings in the FastFit program utilize the same male connection on the T-TECH side of the fitting, enabling quick mating with the new Service Hose Adapter (SRV600), which has a coupler with a matching female FastFit connection. This reduces time and effort required when preparing the T-TECH to service vehicles covered by the new program.