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/Oxygen bagsO2 cylinder bag – black € 69,00 Add to basket Out of stockOxygen/Oxygen cylindersMountain High oxygen cylinder Read more Oxygen/Adapters & partsTransfill Adapter, CGA-540 to DIN-477 #9 (Euro) € 79,00 Add to basket