O2 Union 4mm I, one-touch€ 6,00 One-Touch (Push-to-Connect), 4mm, I union. Only 2 left in stock (can be backordered) O2 Union 4mm I, one-touch quantity Add to basket Categories: Adapters & parts, Oxygen Description Description O2 Union 4x4mm I, one-touch MH p/n: 19056-0400-00 Related products Oxygen/Adapters & partsTransfill Adapter, CGA-540 to DIN-477 #9 (Euro) € 89,00 Add to basket Oxygen/Adapters & partsO2 O-RING suitable for DIN-477 #9 couplings € 1,50 Add to basket Oxygen/Cannulas & masksEDS Face Mask € 13,50 Add to basket