Assuming you have 3/8ths tubing for a siphon or draining or something, just take the cap off and stick the 3/8ths tubing over the shaft of the airlock inside. Then stick the other end in some sanitized water and you have a blowoff tube.
Like this
Yeah my first brew ended up all over my closet walls and ceiling so from now on I'll always start with a blow off tube
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