View basket “O2 O-RING suitable for DIN-477 couplings” has been added to your basket. O2 Union 6 to 4 mm I, one-touch€ 7,00 One-Touch (Push-to-Connect), 4 x 6 mm, I union. Only 2 left in stock (can be backordered) O2 Union 6 to 4 mm I, one-touch quantity Add to basket Categories: Adapters & parts, Oxygen Description Description O2 Union 4 x 6 mm I, one-touch. To connect the smaller 4 mm air tube to the wider 6 mm tube. Related products Oxygen/Cannulas & masksEDS Face Mask € 13,50 Add to basket Oxygen/Adapters & partsTransfill Adapter, CGA-540 to DIN 477-9 (Euro) € 79,00 Add to basket Oxygen/Adapters & partsO2 universal mounting kit from Mountain High € 159,00 Add to basket