View basket “Residual pressure valve Adapter” has been added to your basket. O2 Union 4mm Y, one-touch€ 6,00 One-Touch (Push-to-Connect), 4mm, Y union. In stock (can be backordered) O2 Union 4mm Y, one-touch quantity Add to basket Categories: Adapters & parts, Oxygen Description Description O2 Union 4x4x4mm Y, one-touch. Related products Oxygen/Adapters & partsOxygen Cylinder Transfiller System € 239,00 Add to basket Oxygen/Adapters & partsO2 O-RING suitable for DIN-477 couplings € 1,50 Add to basket Out of stockOxygen/Adapters & partsO2 Union 4mm T, one-touch € 6,00 Read more