Large full size flip top filler cap with base mount (6 holes) and built-in reducer flange, 2" OD neck (1.5" ID).
The base mount has a diameter of about5-1/4" and includes 6 mounting bolts. Spring loaded heavy duty clamp release button and hinge. Opens wide and funnels down to a 1.5" neck.
Cast aluminum, polished shine, brass components