Note that in some variants of EN, especially US, 'spigot' is in fact a 'tap' or 'cock' — this would in other contexts perhaps be a 'drain cock'

So 'bride pour robinet' or 'tuyau droit de robinet' — though it's a little hard to be sure exactly what that is referring to; in fact, the whole expression "straight tube of spigot" sounds quite curious to me in EN, making me wonder if this isn't perhaps in some way non-native — it would probably help to know the provenance of this text?