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On the back of many bigger air compressor pumps there is a small copper tube that comes off the back of the compressor that goes to the unloader. Some compressors have the line some do not. What is this line for? My old 5hp compressor pump had the line on it that tee into the tank check valve...

I have purchased a replacement 5hp compressor pump. The maximum stated pump speed is 1050rpm. My 5hp motor has a pulley size of 9 3/4. According to the pump calculations the motor requires a 8 3/4 pulley. The difference is a 1" which is a difference of 120rpms. My question is should I try to...

First day member and first question but have noticed some very electrical wise members. I brought home a 80gal upright compressor from work about 5yrs ago and just now getting it hooked up. The compressor pump was beat and non rebuildable so it went to scrap. The 1 phase 5hp motor is fairly new...