Kobalt Oil-free Compressor spits water

Depending on use the Kobalt should last a several months. I used a die grinder about 4 hours a day for 4 months and had to replace it. The one I have now has been there about 5 years. With 1 hour use a month. I put a 90 and a long tube coming out of the bottom of the tank to make it easier to drain it after every used