Aircare Medical Supply has a variety of washers and seals for both post valves and the larger valves.  The most popular CO2 sealing washer is the yellow 750 medical washer; part number ACM-033 and the green 750 medical washer, part number ACM-001.  These seals are for the CGA 320, larger, valve.  A good alternative to the yellow CO2 washer is the CO2 washer with O-ring built in.  This washer threads into the CO2 valve and is left there.  This makes filling cylinders quicker and you do not have to affix a washer to the valve on every cylinder you fill.  The user does not lose the washer. The part number for this item is ACM-327.  For post valves, use washer part number ACM-017, or ACM-002.

Qty per bag of 500