Airmaxxx Pewter 400 Compressor & 3 Gallon Steel Tank Kit. • airmaxxx AM400 Pewter Air Compressor. • 1/4" Drain Cock. • 40-Amp Premium Relay. • 3 Gallon 6-Port Steel Air Tank. A dependable entry-level air system ideal forair horns, air lockers, load-leveling, andlight-duty air suspension.