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 Out of stockOxygen/Oxygen cylindersMountain High oxygen cylinder Read more Oxygen/Adapters & partsO2 O-RING suitable for DIN-477 couplings € 1,50 Add to basket Oxygen/Cannulas & masksEDS Cannulas for EDS pulse demand systems € 11,50 Select options