If a molBloc quick connect has become defective or a leak is found around the base of the quick connect the below shows replacement parts and further detail ...
See the link below for spreadsheet with details on proper parts for different molBloc types and ranges:
*** IMPORTANT -Tthe belleville springs must be orientated as shown below. The bottom spring cup faces up, middle is down, and top is up. These can be somewhat difficult to install. All are same part number.