This is  a 48oz tank for the Sebart Mini Avanti and the Mini MB-339 With the extra capacity you will enjoy extended flights. Shown here with JET TECH O-ring style 1/8" ID fuel supply fitting and 90 deg 1/8" vent. 

The tank comes fully assembled and pressure tested, but does not include a clunk.  Clunks may be ordered separately on the "fuel fittings"  page.