|Filling Adaptor Male 540-PB for Aerox Cylinder Systems|
With this adapter and a 540 transfill hose I can refill my O2 bottle for pennies from a large tank purchased from a welding supply store.
AEROX BLTN ADPT OPT FAM-PB3
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Yes, this is the correct number for a CGA540 to PB3. brbr The CGA 540 side is the male side of CGA540, so the adapter would connect to the CGA540 Nut.