This is a heavy duty 30 Amp pressure switch for air compressors. It accurately starts a compressor at 90 PSI and shuts it off at 120. Tested for 15,000 cycles. Perfect for 12 and 24 volt applications! Thread size is 1/8" NPT. This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. *DOES NOT INCLUDE REDUCER OR TANK*