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The round threaded fitting, or GFR fitting, is an asymmetric mechanical pipe connection. It is characterized by its two half-couplings,
The GFR fitting complies with the French standard NF E 29.579. It is used by firefighters in one dimension, the nominal diameter 20 mm (DN 20). It mainly equips 22mm diameter pipes ("commando" pipes) fitted to some fire hoses, including the rotating hose reel (LDT) and forest fire lances (variable speed lance, LDV, 250 and 150 L / min).
The standard also covers DN 80 and 100, commonly used in the petroleum industry for the removal of hydrocarbons. code
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