The Joerns Bariatric Bed Foam Bolster is intended to fill in the space from the length extender.
Warranty: 1 Year.
When users attach the length extender to the end of the bariatric bed, there's a chunk of empty space that needs to be filled in. This foam bolster fills in that excess space, so that there's a complete comfortable surface for the patient's feet.
Joerns RC750 Bariatric Bed User Service Manual