Oenological threaded fittings are consists of a female ferrule and a male ferrule with nut. The coupling is made by screwing the male's nut ferrule on the female. These cone-shaped male and female ferrules mechanically guarantee the seal without needing a seal ring.
Morsello Inox makes a vast range of oenological threaded fittings in these sizes: DN 25, 30, 35, 40 and 50. The company also makes several solutions to couple oenological fittings with Garolla, DIN, gas threaded, Tri-clover, amongst others.