What is the outlet on the Guru like now? I tried to google it but I get all sorts of possibilities. For my controller I used a dishwasher hose which fits perfectly on the 3/4" nipple. Both ends are rubber so you might get that to work. Worst case you might need a little duct tape or another cheap adapter fitting.
Proud owner of the PentaZero
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“I dream of a better tomorrow, where chickens can cross the road and not be questioned about their motives.” ― Ralph Waldo Emerson