I have a SkyOx portable oxygen system. When I want to get it refilled I see that the Airport Facilities Directory tells me which facilities have oxygen using a code that indicates what they offer such as
OX 1 = High Pressure
OX 2 = Low Pressure
OX 3 = High Pressure - Replacement Bottles
OX 4 = Low Pressure - Replacementment Bottles
My question is which of these codes indicates they can refill a portable supplemental oxygen bottle... I'm guessing OX 3 but I'm wondering about OX 1.