The measuring system includes a pump, a special gas extractor, one or two full hoses, or one empty hose or one full hose and one empty hose. Allows:
(a) metered delivery by pump (full or empty hose);
(b) metered gravity-feed delivery (empty hose);
(c) direct delivery with or without pump, without passing through the meter, and emptying and filling of the tank without passing through the meter.
