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 SaleOxygen/Mountain High EDSMH EDS O2D2 with Pressure Regulator (DIN-477) € 1.490,00 € 1.250,00 Add to basket Oxygen/Adapters & partsRegulator Fitting one touch 4mm – 180º € 15,00 Add to basket Oxygen/Adapters & partsMH-400 High Pressure Gauge € 29,00 Add to basket