They fit snuggly in cars' spare tire compartments.
14 L);1/4 NPT ports: 1;1/2 NPT ports: 4;3/8 NPT ports: 2;1/8 NPT ports: 1;Burst pressure: 300 PSI;Working pressure: 150 PSI;Meets SAE J10 & FMVSS 121 specifications;Made in the USA;California Residents: WARNING HornBlasters 4 Gallon 8 Port Pancake Air Tank (Black) - TA-4P There are four 1/2 ports on top, two 3/8 ports on top, one1/8 port on top, and one 1/4 port on the bottom.. On trucks, they fit nicely under the bed for a clean appearance. Powdercoated black finish;Red oxidized interior coating resists corrosion;Volume: 4 gallons (15.