O2 Union 4mm T, one-touch€ 6,00 One-Touch (Push-to-Connect), 4mm, T union. Only 3 left in stock O2 Union 4mm T, one-touch quantity Add to basket Categories: Adapters & parts, Oxygen Description Description O2 Union 4x4x4mm T, one-touch Related products Oxygen/Adapters & partsO2 O-RING suitable for DIN-477 couplings € 1,50 Add to basket Oxygen/Adapters & partsO2 universal mounting kit from Mountain High € 159,00 Add to basket Oxygen/Adapters & partsO2 Union 4mm I, one-touch € 6,00 Add to basket