Comet Sprayer Diaphragm Pump - 5.5 GPM, 350 PSI, 3/4in. Shaft, Model Number MC25

The original comet pump blew up. I took it apart and it was light aluminum pistons and plastic seals. I really needed to get my northern tools spray rig running and so I spent the $600 and bought and extended warranty. Four months and 6 days after I bought the new pump it also blew up. I called comet and talked to Adam who stated, before I could even say what was wrong, that they wouldn't honor the warranty. I asked that they look at the pump but they refused. I called Northern Tools who also gave me a run around and refused to help. Please, please, please, DON'T buy this product.