Method for assembling gas filling device

A method for assembling a gas filling device comprising the steps of:

• installing a base frame;
• placing a lower unit containing a heat exchanger on the installed base frame;
• positioning an intermediate unit including a display above said lower unit;
• arranging side units on both sides of said lower unit and the intermediate unit, said side units housing filling hoses having filling nozzles at their tips;
• arranging a top unit containing a flow meter above the intermediate unit;
• and
• facilitating attachment between at least one adjacent pair of the base frame, the lower unit, the intermediate unit, and the side units by forming corresponding positioning holes in the at least one adjacent pair and temporarily inserting a locate pin within the corresponding positioning holes in the at least one adjacent pair, the locate pin being non-threaded to facilitate temporary insertion within the corresponding positioning holes in the at least one adjacent pair.