Special Features:

C/o u shaped hold down fixture that is used to seal off the ends of the supply and main scavenge filters, during the leak test. These filters are slowly rotated through 360 degree to check for air bubbles

Properties:

A fixture designed to hold/position aircraft components to facilitate inspection, repair, testing and/or replacement of components. D0 not use if a more specific name applies. See fixture (1) (as modified).