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robinet de purge
chem.	purging cock; discharge cock; drain cock
food.ind.	petcock
mech.eng.	drain tap; purge valve; blow-off cock; bib-cock
met., mech.eng.	draining valve
transp.	scupper cock; blow off cock; toggle valve
transp., mech.eng.	manual drain valve

robinet de purge: 6 phrases in 3 subjects

Mechanic engineering	4
Technology	1
Transport	1