This 12-Volt DC air pump has twin bellows and doublt outles to produce aeration of 1 or 2 live wells up to 35 gallons. Weighted glass bead airstones provide greater dissolved oxygen. It produces up to 99.5% saturation of dissolved oxygen. Designed for fresh and saltwater use. Package includes 12 volt air pump, with 6' power cord, copper battery clips, 10' airline tubing, 2 larged weighted glass bead air stones, 2 anti-siphon valves, T adapator, adjustable mounting clip and screws.