[APD] Problem with tank/regulator seal

["Nicholas Plummer" <nickplummer at nc_rr.com>]

I just exchanged the CO2 tank for my planted aquarium, and I am having a 
hard time getting a good seal between tank and regulator.  The old tank had 
what looked like a black rubber or plastic washer that allowed the regulator 
to seal tightly.  The new tank doesn't have that.  Do I need to buy some 
sort of washer or o-ring?

It's a 1.5 hour round trip to the welding supply shop, so I'll be fairly 
grumpy if I need to make another trip. 

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