you can take the entire thing apart...run through some warm water and then refill...thats something you should try though only if the following doesnt work
take the nova off your pv...grab a paper towel...now, blow through your drip tip there right through the nova...a small amount of liquid will appear on your paper towel...dont keep blowing...1-2 quick bursts ought to do it
dry the battery threading..and q-tip out any fluid in the battery connection
then re-connect, it should be right as rain
gurgling is almost always a sign of
juice in the center tube
sorry if you know all this already, based on post count and join date you appear to be a newb...