You really need a reservoir tank with the compressor otherwise it'll be running all the time. I used to use a Bambi that had a tank that was too small. Needless to say it didn't last very long as it ran far too hot. My Sil Air has a 24 litre tank and cycles 3 - 4 times an hour on average. I would suggest that this particular model isn't suitable for a GraverMax.