Airmaxxx Pewter 400 Single Air Compressor, 120 On/150 Off Pressure Switch, Wiring Kit. & 3 Gallon, 6 Port Steel Air Tank. Do You Need A Kit with Aluminum Tank Instead? 3 – 3/8″npt Ports (2 on one end, 1 on other end) 2 – 1/4″npt Port (1 on each end) 1 – 1/4npt Port for Drain on Bottom. Air Tank Dimensions: 20.00″ Long 7.00″ Wide 8.25 Tall 200 psi Max. Gloss Black Powder Coat Finish.