Five Oceans 6 Gallon Portable Fuel Tank Low-Permeation w/Gauge FO-3312 CAPACITY of 6 Gallons 22 Liters. COMPLIES with International Standard ISO 13591 IMCI MONITORING SYSTEM that accurately reads fuel levels. NPT FUEL FITTING with 90 degree angle and 1/4" thread. Dimensions: 23" (584mm) L x 11 13/32" (289 mm) W x 8 27/32" (224 mm) H. ECO FRIENDLY by eliminating virtually most of the fuel vapor.